Triumph Scrambler 400 X

Taking your considerations into account, bikes we would recommend taking a look at are the Triumph Speed 400 and Scrambler 400 X / XC. 

Both will offer you considerably higher performance than your Yezdi bike and will also be comfortable enough to handle daily commuting duties while being brisk enough on the highway as well. 

If you want an air-cooled, torquey engine, then you could even take a look at the Harley-Davidson X440, which is a comfortable neo-retro roadster that has decent performance. 

Take a test ride of the machines you shortlist before picking one. 

Between the Honda H'ness CB350 and the Triumph Scrambler 400 X, we would steer you toward the Triumph bike purely because it offers you significantly higher performance for not that much more money. The Scrambler is also a smooth, comfortable do-it-all motorcycle which has good passenger accommodations as well. The H'ness is also comfortable for two-up riding and is a good city bike, but it will not be able to match the Triumph's performance advantage. 

We would advise you not to go for the Royal Enfield Super Meteor 650 because it is a rather heavy bike at 240kg, which will not be the best fit on traffic-riddled city roads. Moreover, its stiff rear suspension will be the bigger reason to look elsewhere. If you want a RE 650, we would recommend taking a look at the Royal Enfield Interceptor, as that has more pliant suspension and is also much lighter.