@Everyone saying the OP isn't ready for the upgrade
I don't think it is a matter of skill or time invested into his 250. It, honestly, is a lot more based on personality. I have 2 good buddies I ride with (one started on a GSXR600 *GASP*) where we'll rip apart each other's riding styles, reference proven technologies (such as those gained from Total Control or read from Twist of the Wrist) and figure out how/what we did wrong on almost every ramp run. On the flip side, I've noticed a large number of riders have this gigantic ego shield where they won't admit any faults.
If the OP is an analytic individual that enjoys constantly developing his skills to reach the levels that the listed bikes are capable of, then by all means buy one. On the flip side...he'll meet Mr. Asphalt if he treats the throttle the same way he does on the 250 lol