Whilst I concede that Vista will be the place to be soon enough, you have to bare in mind that until the early months of next year, it could be a bit of a roller coaster with u`r games. Outside of games Vista runs how it`s s`posed to afaik. (notice I didn`t say it runs well

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Sure u`ll get that many more fps on XP for the remainder of this year, but I feel once they`ve sp1`d Vista and a solid vLite version of it is made for u`r install, it`ll be on a par with u`r present XP possibly. Plus of course u add about the dx10 stuffs.
I personally find it hard to believe that dx10 won`t appear for XP - what`s most likely to happen is it`ll appear a number of months after they`ve frightened the fightenable into purchasing Vista b`cos of it.
Meh. Tricky, if u can indeed buy an XP with a substancial wedge-off-vista voucher, I`d probably be inclinded to advise that way.
Both sides have valid points atm.