usually i will just ask ppl go for z1000 directly.
Also bear in mind that the 2010 version is pretty much different compare the old one. (for both z750 and z1000)

You can consider ZRX1200R as well, its a 5 speed retro kawasaki muscle bike, doesn't suit everyone's taste though.

s1000rr really worth the price considering its a bike from europe. The reviews have been positive and power to weight ratio should be the highest as well (But all of them are almost the same anyway).
you should include gsx1000r instead of hayabusa in the comparison.
do remember all of them are not comfortable for long distance ride (as they not designed for such purpose), R1 is one of the "best" performer in this kind of thing.