go to xp.. and if you miss w7 get a theme and a wallpaper ^^
lol, he wont miss 7 cuz of the eye candy, he will miss it because it performs better overall. i have it installed on a mid-range gaming rig (x64 vista -> x64 win7), and my laptop (x86 XP pro -> x86 win7) and overall i have seen huge performance gains, even on my laptop, which barely makes the minimum requirments.
if you have the hardware to run it, i fully say stick with win7, here are my reasons.
- better resource managment.
- better file indexing, and boot times
- stability (while you may argue that your xp is more stable then the win7 beta. i have yet to crash it, and i spend alot of time on my computer(s) )
so, if you do downgrade, you will regret it because XP is a POS compared to even vista.