(Last month)
http://www.microsoft.com/hardware/mouseandkey...px?pid=018
http://www.i4u.com/full-review-685.html

And it doesn't cost a fortune either :). Probably because it's a small... Comfort mouse 4500.
So likely best for grippers (me) but at least it's a start. (Also there's always modding ;).

EDIT:
1000 DPI
8000 fps
28 G maximum acceleration

131 g
L116.1 W67.9 H43.18
cable - 6 ft (1.8m)

FULL review in post #29