Re: replacing my 9700
What's the problem with the ATI drivers, seriously? The FX cards are not future proofed in any way, that's the bottom line. You're going to be losing major image quality by switching to an FX card.
All I have is, stay away from ANY GeForce FX at all costs. The least you could buy is a GeForce 6800 128MB. For the price you mentioned, you should buy a Radeon 9800 Pro 128MB for around 110-120 quid. Just don't get an FX card, they are the worst generation of nVIDIA video cards.