3x BenQ GL2450
NCIX had them on sale as a bundle. The downside of going with cheapo BenQ is that they didn't include DVI cables. I currently have it hooked up using a DVI, a DVI-D/VGA adapter, and an HDMI cable and appropriate cables on order.
I'm kind of surprised that my GTX 660 is able to push this many pixels out, but it does. I just had to turn down the AA in some games.
It's also awesome for software development (Eclipse + Firefox + Terminal + PGAdmin on screen at once) and although I haven't done anything overly GISy with it yet, I expect I'll have good use for all those pixels in that usecase too (Swap QGIS for Eclipse pretty much)