You're Pretty Smart.
Don't get me wrong; everytime a new crop of 600s come out, I shake my head in wonder. So, on my part, it's not a case of moto-snobbery.
My deal is, I don't feel comfortable with the vibes, and the torque-rise, and I don't like shifting anymore than is absolutely necessary. I've spent nearly thirty years (on and off) driving vehicles that red-line under 2000 rpm. So, coming on the throttle, over ten-grand, makes me wonder when I'm gonna have engine parts as peircings.
If you're a standard-issue human being, a 600 is probably all you'll ever need. And new one should keep just-about anyone happy, long after the payment book is empty.
On the street, litre bikes are best suited for doing wheelies (that's why stunter love them). But, put 'em in the tight-twisty stuff, and they can become a hand-full-of-Hell quicker than a synapse can open and close.
So, you're pretty smart if you want to tend-to-your-knitting and stick with a 600 for a good-while. That's more than can be said for a lot of riders.
Hayabusas? Hey, what's not to like, about a BULLET TRAIN! You ever clock one out to the stops in the it top-cog, give me a call; I'll gladly send you new underwear ;-)