You won't get DX10 without Vista or Windows 7.
Originally Posted by Robilar
Until I find a game that is actually better in DX10, I am not switching my main system from XP64 bit. I have vista on two of my other systems and frankly its bloated and resource hogging compared to XP.
Unfortunately, eventually games will start to actually provide a better experience with DX10 and I will be forced to switch.
For now though XP64 is the best.