Best gfx card for increased fps?

[Jason]

5670/5770 - both under a hundred pounds, I had two 5770's in crossfire, but sold my second as I didn't get much of a performance increase. With only one, I get more than enough fps, and play all other games just fine too, e.g. crysis, css, l4d, cod.

Ofc, need to see what psu you have, for cards like Elite suggested, you'll want 500/600watt psu's just to be on the safe side. If you want to know more, skype me.