Since that monitor has a display port in you dont even need an adapter. Any of the newer 5xxx cards or 6xxx cards that are at least 5770 will be able to handle 3 of those monitors, if you want to play across all 3 screens i would get at least a 5850 probably a 6970.
A previous poster seems to think I'd need two 6970's to run three U2410's at 1920 x 1200. I'm just trying to cut through the FUD, and opinions to get some facts. Any articles about this you could reference?