Since most all bikes are fast enough for the street I'd prefer the bike with the shortest stopping distance. I made up a list of the bikes that MCN teated that stopped from 60 mph in less than 110 feet. (Note that the fastest stopping cars run in the 120s, the 911 for example.)
Buell M2Cyclone
Monster 750
Monster S4
Vrod
Nighthawk 750 (shortest distance of all)
VTX1800
Vulcan Mean Streak
Marauder 800
Speed Triple
Speed 4
TL1000S
Only one "sportbike" on that list. And it's not the ZX6R. Looks like you bought an underperforming bike with a poor cost/performance ratio...
With the awful visibility of the sportbike and the poor handlebar leverage and it's no wonder that the kids on 600s are killing themselves off so quickly.