The Kawasaki Ninja 500 - while priced very high for what it is - is a sweet, capable and in true Japanese fashion. It is a machine that is likely to be reliable and last you for years without giving significant issues, provided you maintain it correctly. 

You could also take a look at the Yamaha R3, although most dealers we have spoken to in major metro cities have informed us that they don't have any stock, nor are they expecting a new shipment anytime soon. 

Its best to speak to your nearest authorised Yamaha dealer and see what the situation in your area is like. The R3 is a rather simple machine with no frilly features. But it packs a potent engine and chassis, and it has also cemented its reputation for reliability in our market. 

The Kawasaki Z650 and Ninja 650 are the only reliable big bike options below the 10 lakh rupee mark from a reputed make. Also, you'll have to considerably extend your budget for anything else. Should you be able to do so, bikes like the Suzuki GSX-8R and Honda CB750 Hornet will be the next stepping stones. 

Try to take a test ride of these machines to see which one suits you best before you make a decision. 

Unfortunately, within your budget, you won't find a brand-new machine from a reputed Japanese or European maker on the market today. In fact, some of the most affordable big bikes in India, like the Kawasaki 650s, Triumph Trident 660 and the Honda CB750 Hornet, all start above the Rs 7 lakh (ex-showroom) mark, with GST 2.0 partly contributing to this.

If you are open to the idea of a used machine, you will find Kawasaki Z650 / Ninja 650 and perhaps even a Honda CBR650F in your budget. Do bear in mind that you need to be cautious and do a thorough background check on these machines. Because a replacement mechanical part will cost you a pretty penny. And these older bikes also won't be E20 petrol compatible, so that's another factor to consider. 

Since you own a KTM 390 Duke and have spoken about its performance, we'll put that parameter at the forefront when recommending some options. The Kawasaki Z650, while a quick, light and premium machine, can feel a little dull if you're stepping up from the fast KTM. While the Honda CB / CBR 650 models are now knocking on the door of 100hp, they are also quite heavy machines, and the engine is rather peaky, which means that you'll really have to work for the performance. 

In the Honda lineup, we suggest you look at the CB750 Hornet, as that is a punchy and lightweight machine that will feel like a good step up from the 390 Duke. 

You can also take a look at the Suzuki GSX-8R because even though its spec sheet is quite modest, in the real world, this is a very fun machine that doesn't sacrifice practicality too much. Another option in the same segment is the Triumph Daytona 660, which is also a relaxed, real-world usable sportbike with engaging performance. 

If you want to break the 100hp barrier well and truly, bikes like the Triumph Street Triple R and Kawasaki Z900 are the most affordable options. The former is an accomplished track machine, while the latter will be a sublime road bike owing to its creamy smooth engine and plush suspension.

We recommend a thorough test ride of all bikes before you choose to go ahead. 

If you want a retro-looking motorcycle, look no further than the Royal Enfield Interceptor 650. With its old-school looks, smooth yet punchy engine, reasonable comfort and relatively affordable price tag, it is an option that warrants serious consideration. 

Since you already have a Honda, you can take a look at the NX500, which will be a good option with its refined twin-cylinder engine and comfortable long-distance capability. 

If you are open to the idea of a pre-owned machine, in your budget, you can get a Kawasaki Z650 / Ninja 650 / Versys 650. All three are good both in the city and out on the highway, but the Versys would be our pick because it will be the most adept at tackling Indian roads.