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Personally I don't see a reason not to go 64 bit. All drivers for any product will need to be 64bit compatible to be WHQL certified.
Dan_D is right. Most problems are seen on the 64 bit side. I'm using Ultimate x86 for now...and I will be for a few months. Down the road, I'll contemplate a switch.
I got a gift of Vista Ultimate from a Microsoft employee friend, so I have to install it now because he keeps asking if I have yet. I have my OS X box and laptop with XP/Ubuntu for everything but games and solidworks 32-bit so I am going to go with 32-bit for software compatibility. I will probably dual boot 32/64 to test the waters after I get my 32-bit setup running smoothly.