Sawyen would you stop scare mungoring.
I have an 8800 on vista and only have a little glitching at the start of a few games and no other problems.
Xp there a little more troublesome but thats probobly why they've just released another beta driver.
As for which graghics card would be best value with a tight budget, i would go for this one.
http://www.scan.co.uk/Products/Produ...oductID=545050
It's the only one under £190 that will give you a 550mhz clock speed.
I'm unfamiliar with your case and psu but the power rating will be fine as i'm using the hx520. You just need to have the 4 pin connecter for the card.