I'll see if I can get the 5870 for £60. I've decided I'm not spending more than £80 on the 5870. If the 5870 goes for more than £80 then I will just keep saving and get something like a 6950 or 560 Ti. Sound all right?
£83 for the 6850 does look good though...
Just seen a used 6870 on eBay for £85 buy it now, I'm gonna go for that I think.