Hi, I'm building a rig for a friend and I'm contemplating triplehead2go. What kind of graphical horsepower is needed to run lfs maxed settings with decent aa/af triple head? I was planning on using an Evga 8800 GT superclocked, on factory clock, how will it run on that?

That should run it fine - the CPU will also be an issue.

What screens will you be using?

Nothing has been bought yet. The complete computer setup I was planning is at home , here's the bits I remember:

intel E8500
XFX 680i mobo
EVGA 8800 GT 512 mb superclocked edition

It's going to be solely for racing. (LFS and RBR possibly)

Haven't really started my research on the screens yet, I figured around 19" LCD with 4:3 aspect. Small bezels would be a plus I suppose. Any suggestions?

That sounds ok although i'd take a different mobo (ie a P35 based one), or a 780i if SLi is NEEDED.

Should be fine for what you need, though.