In the 350cc space, bikes like the Royal Enfield Hunter / Classic / Bullet 350 and Honda CB350 trio make for good options considering your mixed usage. All of them have upright ergonomics, comfortable suspension setups and decent fuel economy. 

If you are open to waiting for a few months, Bajaj will be releasing 350cc versions of all the Triumph 400cc bikes. These will offer you noticeably more performance than the aforementioned air-cooled 350s while being priced similarly. 

Between the Royal Enfield Classic 350 and Meteor 350, the former would be our recommendation. The Meteor's feet forward position will transmit more jolts to your back over bad patches of road. Therefore, it won't be comfortable over long stints in the saddle. The Classic's upright and neutral rider's triangle will be easier to live with on a day-to-day basis. 

You should also take a good look at the Honda CB350 models because they have a similar riding experience to the RE 350s. But are much lighter and come with alloy wheels and tubeless tyres. They also have a slip/assist clutch, resulting in little effort when operating the clutch. 

Since you are a taller person, looking at an ADV like the Hero Xpulse 210 and TVS Apache RTX 300 is also a good idea. Of the two, the RTX is the better all-rounder, but the Xpulse is lighter.

Take a test ride of these bikes so you can decide which is a better fit for you. 

For city use, we'd recommend picking between the Royal Enfield Classic 350 and Honda CB350RS. Both seat the rider comfortably, although the CB350RS has a slightly sportier seating position. But also have a comfortable suspension, which is what you'll value in the city. If ridden sensibly, the two 350s will also return decent fuel economy. Do bear in mind that the Classic 350 is likely to be updated with a slip/assist clutch soon. if you are looking to buy this bike, we'd advise you to defer your purchase by a few months.

Since you're already looking at the Classic, its sibling, the Hunter 350, also makes for a great city bike. Despite its relatively smaller size, larger riders will fit just fine on the Hunter, and this is the most city-friendly machine of all the bikes you are looking at. 

The Harley-Davidson X440 is also a good option inside the city with its torquey engine, neutral ergonomics and decent suspension. But its fuel economy will be lower than the other bikes, and its top model falls outside your budget.

Take a test ride of these bikes to decide which is the best option for you. 

The Honda CB350 trio are very similar machines and we would recommend choosing the one you like the look of the most. These are plush, smooth, proven and reliable machines, although don't expect too much in terms of performance from the relaxed, long-stroke single-cylinder engine. 

For similar reasons, the Royal Enfield Classic / Bullet / Hunter are also worth taking a look at. The first two will feel more substantial and have more spacious ergonomics. The Hunter will feel much lighter and more compact in comparison, so depending on the sort of bike you want, you should choose between these three.

Finally, the Guerrilla 450 is a far sportier and faster bike than these slower 350cc models we've suggested above. If this is the sort of riding experience you're after, it makes for a good purchase.  

Since this is your first bike, we'd recommend taking a proper test ride and seeing which one is best for you. 

If you want something with a bit of sporting intent in the way it rides, the Triumph Speed 400 makes for a good purchase. It is a relaxed city commuter with good suspension, a smooth and grunty engine, as well as an agile demeanour. If you want a more mellow riding experience but want a Triumph, the Speed T4 makes a good case for itself. 

If you want bikes with a more old-school riding experience, then the Honda CB350 models and the Royal Enfield Bullet / Classic / Hunter 350 models deserve your attention. 

All bikes here have been out for multiple years now and have largely proven themselves to be reliable machines. 

A test ride of these bikes will help you decide which one suits you the best.