Ermahgerd spertsbirke

[DryRob]

I've had a pipe dream regarding a buying a 600 sports bike for a while now. Any advice on what's good? CBR, R6, ZX, GSX?
 
Just an idea at the moment, I wouldn't wanna spend more than £2,500 as it would be a summer bike and I won't consider giving up the FZS as I know I'll regret it.
 
Is it worth it or would I be buying myself a money pit at that price?

[caretaker]

if you can afford to buy another bike, go for a possible future classic. a zx636 is different to the norm but a clean R6 might also appreciate a few years from now.