With an 8600, go with the PC, the mods will open you up to so much more than the standalone game on the 360. Sure they're adding quests and raising level cap in some DLC, but that still won't trump mods.
Only thing I'm worried about is not having a good enough gfx card, the recommended wants 512mb, i only have 256mb :< I pass the minimums but fail the recommended on that requirements test site. Still seems like the game was more designed for PC
if you want to play it safe, i'd choose the 360 (which i did) But i would love to have the PC version, just for mods and stuff
8500GT. Runs the game perfectly in High. Apart from smoke particles, slows down a bit then. Grr. Smoke particles. Anyone wish to buy me an 8800 / 9800 for Xmas?
I got it for the PC just for the mods, same as Oblivion, the mods will no doubt expand the game. You do get more for your money.