Thanks for the responses so far, let me see if I can clarify a little.
whats wrong with amd? you seem to be ignoring them
I've got Nvidia 3d Vision and a number of glasses, so I'm really only considering Nvidia Cards.
1)Power supply make and model?
My power supply is a Dell H1000E-01. I'm currently gaming at 1920x1080, but as I said I'm considering picking up a third Acer GD235hz for 3d Surround, assuming what I choose supports it.
(OP updated to reflect this information)