If you want a budget card that performs rather well, the EVGA GTX 650 ti 2 gig is the card you'll really like. The boost has some minor extras but not a big deal.
I've had my GTX 650 ti cranked up so high I could have sworn I heard, "Take cover men, she's gonna blow!"
Seriously though it's a lot of exceptional bang for the buck. Or in your case, for the pound.