Dead Rising 2
Yes I keep hearing that, it's off to Steam I go as I can't find the PC game in any stores near me.
It is graphically superior to the console versions
I can second this. There are and extremely large amount of zombies on screen, and it's handled very well on my computer at least.
I have an Intel Quad Core @2.2 Ghz, a ATI HD 5850 ( 1 GB DDR5) and 4 GBs DDR2 RAM running on Windows 7 Ultimate.