IMHO, absolutely not...!
If you want to try 64 bit computing, it should be Windows 7, or nothing.
Although different people report different results, XP is notorious for driver problems in its 64 bit offerings, Win 7 has no such issues.
I have been successful in finding Win 7 64 bit drivers, for any piece of antiquated hardware I have thus far attempted. (Hauppage tuner, Canon 8400F scanner, any Epson printer).
What you might have an issue with, is finding motherboard drivers, should you decide to go with Win 7. It can be impossible to find Vista or Win 7 drivers for older pre-built PCs. If this is a home built PC, you would have somewhat better luck finding drivers at the motherboard manufacturer's website.