I do know that XP 64-bit was horrible for driver support. Vista 64-bit is a much better option, in my opinion.
I don't understand why people despise Vista. I knew it was going to be a little different, so I took the time to learn the ins and outs of it. After a few days, I pretty much had it down-pat. I cannot stand XP anymore.
And for the record, I have my Vista set to look like the classic Windows look (i.e. from the Windows 98 era). So it's not just a fancy GUI for me.
Cheers
Troy