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. 

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.

Among the RE 350s, you can consider the Hunter / Bullet / Classic models for their comfortable ride, neutral ergonomics and smooth as well as characterful engine. In a similar vein, the Honda CB350s also warrant strong consideration for similar reasons. 

All the Harley-Davidson X440 models have a similar riding experience and only differ in terms of features and design, so pick the one you like the most. 

Lastly, we would also recommend you take a look at the Triumph Speed T4 and Triumph Speed 400 as they offer great performance and quality at a reasonable price. 

Take a test ride of all the bikes you shortlist before you decide. 

We would advise you to look at other options than the Royal Enfield Bear 650 because we found the rear suspension to be very stiff in our time with it. This means that on less-than-perfect city roads, your back will bear the brunt of the bumps, which won't be ideal given your long daily commute.

Instead, we would recommend you look at the Royal Enfield Himalayan 450 because it has much better suspension comfort and will have exciting performance while also fitting in your price range. 

If your heart is set on a 650cc bike, then the Royal Enfield Interceptor 650 is the best bet for city use with its supple suspension, neutral ergonomics and creamy smooth engine. 

Take a test ride and decide before you buy. 

Since you are used to a good amount of performance, we'd suggest you move to something like the Triumph Speed 400. This bike will meet your needs of having a comfortable riding position as well as a reasonably low seat height. 

There are more comfortable options available, but almost all of them are adventure bikes with relatively tall seats. If you can get along with a taller seat, we'd recommend options like the Royal Enfield Himalayan 450 or KTM 390 Adventure as good replacements for your Aprilia RS 457. 

Of the options you've shortlisted, the Royal Enfield Himalayan 450 will be the best all-rounder with good highway manners, plush suspension for rough roads, and it's usable inside the city too, although its weight and general size need to be kept in mind. 

The Meteor 350 and Triumph Scrambler 400 XC will be better in the city than the Himalayan, but out on the highway, your comfortable cruising speeds will be capped at 80-100kph. Take a thorough test ride before you decide.