Cheap card to run SWTOR in eyefinity?

I'm buying my best friend a PC. (or most of a PC, a lot of the parts are handmedowns but they are nice quality. AMD 955, 4 gigs DDR3, 500 watt PSU.

He has a 4850 right now but he really wants to run eyefinity. He has 3 identical 19" hannspree monitors. What the cheapest graphics card that will run that?