Windows 7 64-bit.
First, definitely 64-bit to allow for >4GB RAM usage. Second, Windows XP support is ceasing (has ceased?) so I'd go with the current version (7) if I were you. Finally, DirectX10 and 11 do not work with XP so you will not get the best graphics features into the future if you stick with XP. I have Windows 7 64-bit and have found it quite stable and easy to work with.
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