2 x 580's. I believe the 590 cant use 3 dual-link dvi connections. Also 2 x 580's would be faster than a single 590. You may want to look into getting two 3GB versions of the 580 as 1.5GB VRAM is not really enough these days.
False! ;)) I use a GTX 590 for 3D Vision Surround;)) so It fully supports 3Dual Link DVI connections. 2x 580 are faster true;)) but eat significantly a lot more power and make more noise;)) So take into account the PSU of if you want to go on 2x580;)) In your case I would say get another 580 cheaper than buying a 590;)) but be sure your PSU handles both of them;))
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