Video Card upgrade - Suggestions?

I've got 250$ from the wife for anniversary that I can finally update my graphics card. I'm running an ATI 5770 that i've had for a couple of years now. One of my big things is Eyefinity. I love having my 3 monitors, but the 5770 is lagging quite badly in skyrim with all 3 going.

Anyone got any suggestions on a good card running eyefinity pretty well?

I've got my Active display port adaptors already so if its the newer mini adaptors i'll have to buy some new ones.

Any help is appreciated.