The new GSX-R 1000 is probably the quickest, though not the fastest for top speed (who cares?)

Only about 365 pounds dry, 165hp to the wheel, good aerodynamics... I had to buy one. [img]i/expressions/face-icon-small-smile.gif[/img]

 

granted this isn't quite stock, but check this out: "This 420 rear-wheel horsepower bike topped out at 213.766 mph and remained remarkably calm, cool and collected during top speed passes" Here

 

My buddy died on a cbr 929rr. I told him his cbr 600 was too fast for me to ride again. Broke his neck in 4 places, dead before quit rolling.