Tracer 700 is a great bike but I don't think it does much in the wind deflection department without a stupid big screen on it. Although the versus is a good bike too I personally prefer the Ninja 650 as its looks loads nicer and it makes use of the limited power better than the versys. That may well be a sticking point for you coming from the 600, they do have a decent chunk of power compared to the twins you've mentioned above.Have you thought about something like a modern CBR 600F? They aren't stupidly sporty but enough to have fun on?VFR800 is also a good option too, can pick one up for a very good price these days