Only reason I haven't gone to Vista yet is cost. I have no quarms paying for an OS, but for the 'proper' version it's about £400. I'm not gonna fork out that when XP currently does everything I want and does it well.
If they made it £100 for the retail version I would buy it. Simple as.
This whole game of ultimate/32 bit only, 64-bit, non-aero glass version really peeves me. Apart from those suffering with XP home, no one with less cash has had to put up with an naff operating system because they couldn't afford the 'best' version.
I have considered the OEM version but will be changing my motherboard at some point before I buy Vista, so that would screw me right over and have to buy it again.
Anyway, if DX10 is possible on XP, then great... it wont stop me from buying Vista when it becomes economical to do so. I have a DX9 card but would still get Vista, mainly because it is a newer operating system, and has had less time for people to find exploits for it, not because of DX10 purely.
Once again.. if Microsoft had made the price reasonable to start with rather than stuffing the UK/Europe with the falsely inflated cost, they wouldn't have had to make DX10 a Vista only affair (although i have read a technical article explaining why it couldn't be done anyway).
Matthew