If you want an adventure bike that is E20 compliant, you will need to either purchase a new bike or search the pre-owned market for a lightly used model manufactured within the last 1 or 2 years. 

If you are looking for a new bike, we would recommend paying the high initial purchase price of the twin-cylinder Honda NX500. It is a rather sorted machine in almost every regard and will feel like a nice step up from your single-cylinder KTM. And since you're familiar with the trouble-free Honda big bike ownership experience, the NX500 makes for a logical step up. 

If you decide to go for something a little less pricey, then bikes like the latest KTM 390 Adventure models and the Royal Enfield Himalayan 450 are also options worth looking at. 

You also have the option of waiting for the new BMW F 450 GS, although its pricing will be similar to the Honda bike rather than the single-cylinder models mentioned above.

A test ride of everything you shortlist should help you make a decision. 

The two Royal Enfield 650s you are looking at are limited in terms of comfort in one way or another. The Continental GT 650 - with its committed rider's triangle - will be comfortable only for short blasts before you start to become uncomfortable. 

Meanwhile, with its rather stiff rear suspension, the Bear 650 will toss you around over anything other than perfect tarmac roads. Between the two, we'd still recommend choosing the Continental because at least you have the peace of mind of tubeless tyres if you fit the accessory alloy wheels to it, which isn't possible on the Bear. 

If you are open to considering the Interceptor, that makes for a fun Sunday bike, too, with far fewer compromises than both of its aforementioned siblings. 

A test ride of all three will help you make up your mind. 

Since most of your usage is inside the city, bikes like the Hero Xpulse 210, Royal Enfield Bullet / Classic / Hunter 350, Honda CB350 trio and the TVS Ronin will make for good options to consider depending on your preference. 

If you do want something a touch sportier but not very rambunctious, then the KTM 250 Duke also makes for a great companion. 

A test ride of everything you decide to shortlist will help you make a decision. 

There's no way to accurately portray how much the maintainance cost of the BMW F 450 GS will be, as it is yet to be launched. However, BMW bikes have a reputation for being a little pricey to live with, even the smaller 310s. You shouldn't expect the F 450 GS to be as easy on the wallet as its peers, like the Royal Enfield Himalayan 450, KTM 390 Adventure models or even the Honda NX500. 

We recommend you wait a while before you buy the F 450 GS so that you can see thorough reviews of the bike. Also, you can speak to actual owners of the machine, and then make an informed decision. 

The Harley-Davidson X440 is built by Hero and is a simple motorcycle without too many complex parts or features. As such, it should largely be a decently affordable machine to live with by and large. Resale value is very subjective and is sensitive to the area you reside in, as well as a multitude of other factors. 

If you want something similar, bikes like the Honda CB350 models, Royal Enfield Meteor 350 and Triumph Speed 400 make for promising alternatives.

Take a test ride before you decide to see which one fits you best. 

Since you mentioned you have long commutes, and you want something fairly engaging to ride, we'll recommend a mix of ADVs and comfortable roadsters. The new TVS Apache RTX 300 makes a strong case for itself as a single bike to do everything. It is definitely something that should be near or at the top of your list. 

You can even take a look at the KTM 390 Adventure models and Royal Enfield Himalayan 450 - both are quick, comfortable and have great long-distance capability. 

If you want a more road-biased bike, then options you can look at are the Triumph Speed 400, Royal Enfield Guerrilla 450, TVS Apache RTR 310 and KTM 390 Duke. Depending on the balance between performance and looks you want to strike, they all have something unique to offer. 

Take a proper test ride of all bikes you shortlist before making a decision. 

Since this is your first bike, you should ask yourself what sort of rider you are and then pick the machine accordingly. If you feel you enjoy speed and want a sporty, engaging machine, then something like a KTM 160 / 200 Duke, Yamaha YZF R15 V4 / MT-15 and XSR155 will be good options to consider. 

If you want to have a relaxed riding experience and want something stylish, then a Royal Enfield Hunter 350 or TVS Ronin would be a good starting point. Lastly, if you want a single 'standard' bike that can do most daily things, then something like a Honda CB300F would be a good option. 

If you want something that prioritises fuel efficiency, a 160cc commuter from Honda, TVS, Bajaj, Hero or Yamaha would be the way to go. 

Take thorough test rides of each machine you consider before making up your mind up. 

Let's dissect each bikes strenghts and weaknesses so you know what you're in for. The TVS Ronin is a relaxed, comfortable, peppy and relatively fuel-efficient machine. If you don't mind how it looks, the Ronin is a machine that will keep you satisfied for a long time.

The Yamaha XSR155 is essentially a handsome MT-15 with some small ergonomic changes. It is the sportiest machine of all the bikes you're considering and that reflects in its canted forward riding position and stiff suspension setup. If you have good roads around your residence, then the XSR makes for a compelling purchase.

The Royal Enfield Hunter 350 and the Honda CB350 H'ness are similar machines with somewhat familiar riding experiences. Both are comfortable, look good and have big, torquey air-cooled engines. The difference is that the Honda feels like a more substantial bike that needs a little more effort when riding, owing to its super tall gearing - not necessarily a bad thing, if you're into this sort of thing. 

The Hunter will feel smaller, lighter and more flickable inside the city. Additionally, its well-judged gearing will ensure you don't have to make many gear changes. 

Take a comprehensive test ride of all 4 before you decide.

The Triumph Speed T4 will make for a better all-rounder because of its larger and more flexible 398cc engine. It is perfectly usable inside the city, and on the highway, you can cruise at early triple-digit speeds without breaking a sweat. 

If you want similar looks but more performance and better componentry, the Triumph Speed 400 makes a good case for itself. 

The Yamaha XSR155 is a much smaller - and lighter - bike that will have better handling and fuel economy, but will feel a little out of its element on the highway. 

You should also look at the Royal Enfield Bullet / Classic / Hunter 350 models (depending on your budget and design preferences). They are smooth, charming and comfortable machines that can be used both inside the city and on the highway. For similar reasons, the Honda CB350 trio also warrant serious consideration. 

A test ride of all of these, as well as anything else you're considering, will help you decide which one is the best fit for you.

The Royal Enfield Hunter 350 has stellar pricing, and it's a big reason why we see so many on the road. In addition to that, with its most recent update, the company has also ironed out some of its most pressing issues and made it a more well-rounded machine. 

The Honda CB350RS has a similar riding experience to the Hunter, but it will feel like a more substantial machine when you're riding it. 

The Royal Enfield Meteor 350 weighs nearly 200kg and can feel big, especially in traffic or at slower speeds. But once you get moving, it masks its weight really well. 

A test ride will help you decide which bike is right for you.