Well games like Crysis are already starting to tax Vista 32, so i'd go with the 64 bit. Provides extra breathing room, plus it'll future-proof your PC nicely.
Well I've been hearing a lot about software incompatibilities with 64-bit but I had that during beta and I didn't have that many problems, although I did not use any games at all. I'm pretty sure the Ultimate package comes with both so you can install 64-bit and see if it works for you and if it doesn't, just switch back to 32-bit.
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