psu should be enough...but I'd listen to whatever Phaedrus says before I listen to myself. lol.
3D surround: 3 3D-ready monitors (Asus and Viewsonic make them) with a pair of active shutter glasses to make your games more realistic/pop-out/visually blah blah blah (like watching Avatar 3D in the theater) I'm not a fan...got me nothing but headaches and nausea after an hour of it.
2D surround: same, only not 3D. Triple monitor gaming goodness @ 5760X1080 and beyond (depends on your monitors' capable resolutions) Only caveat: bezels. The thinner the monitors bezels, the less distracting they are...but in my experience they just fade away when you're gaming.
I know 580's scale incredibly well in 2way SLI...reviews (guru3D) showed not that much more of a difference between 2 and 3 way, other than the 1.5GB increase in VRAM, which is great if you're pushing three monitors at beyond 5760x1080, or are really really in to Crysis with real life mod and metro 2033.Edited by Mongol - 12/24/10 at 9:20am