I got my GeForce 8800 working with some updated drivers just now. No more random crashes and seemingly full featured - including Direct3D 10 [grin][grin]
I'm going to run through some stress-tests to see how it handles under load and see if my crappy 420w PSU can handle it - may not need the 580w PSU after all. Bit annoying that overclockers.co.uk don't seem to let you cancel orders - guess its a reasonable investment for the future though [headshake]
3DMark 2006 reports around a 10x speed increase over my older 7300LE, which I won't complain about!
I'm going to go sit back with a big grin. I'll go all bipolar and say I love Nvidia and Vista now [looksaround]