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For the most part, 32-bit and 64-bit versions of Vista will have the same support. For Vista, drivers for both 32 and 64-bit are required.
With that being said, I see no reason not to go 64-bit. You get the added advantage of 64-bit applications, and can handle more memory. Even if you are only going to have 2GB of memory now, upgrading to more later will be a breeze.
Go 64-bit.