[citation][nom]greghome[/nom]IMO, 3D is still not as appealing and no as cheap as Eyefinity or 2D Vision Tri-Screen Gaming.[/citation]
I'm a fan of both 3x monitor set ups, but 3D is a lot cooler.
Problem with 3x monitors is the fish-eye effect that's very disturbing (and not fixable) in landscape mode. The best you can do with 3x monitors is use expensive 1920 x 1200 IPS monitors in portrait mode, but in this set up the bezels are normally cutting right through game HUDs / hotkey bars and puts the bezels far too close to your center of view.
Further more, for this kind of Eyefinity/Nvidia surround monitor set up, costs about $1200 - $1500. (Or even more expensive projector set ups that require a ton of space and cost as much or more if you want to try and get rid of the bezels)
Now consider Nvidia 3D. It adds amazing depth and realism to the games over 2D, doesn't have a negitive "fish eye effect", no bezels to deal with, same GPU power requirements as 3x monitors (or less), doesn't interrupt game huds or hotbars and only costs about $600-700 for the most expensive 27" screen + glasses combos. (even cheaper with smaller monitors.
The clear choice is 3D imo.
But 3x monitors is still much better then single 2D monitor. I rocked 5760 x 1080 in BFBC2, Aion and L4D for a long time
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3D is cooler though.