Think the more memory the better for running x3 monitors, i have decided to keep his 22" samsung and get another x2 the same (bought 1 already so 1 more needed) was gonna get x3 20" screens.

They make some cards like the 6950 flex that have display port enabled so no need for a monitor with just that.....also you can get an adapter for around £12 to get around this using a normal card......busy looking for a cheap 6970 at the moment.