I'm currently using 2x 27" Samsung SyncMaster SA350's.
They're both 1920x1080.
So 2x [1920 x 1080 = 2,073,600] = 4,147,200 pixles.

I was previously using a Samsung 30" monitor.
That was 2560x1600.
Or 4,096,000 pixels.

The entire team on one side of the 30", plus the main... looked really good.
Having everyone on a 27" doesn't look that great, but having one toon (main) on its own monitor, and the slaves on the other looks good.

I would have thought 2x 27" would be a lot more pixels than 1x 30".