whats the best version of vista to get?

Most PC's that are capable of running vista will have a 64-bit CPU and no you dont need 64 bit ram, 64 bit mobo, 64 bit graphics card.

Some hardware like TV-Cards/Sound Cards things like that dont have 64-bit drivers available.
 
Nope you shouldnt have any problems, if you only have 2GB RAM or less its worth getting it up to 4gb for the price of ram! otherwise no point in installing 64-bit?
 
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