SBT.. i love ati vid cards.  I've got a relatively small one in this box.. and HD7750; but, I've got my eye on either one or two crossfired firepro cards.  Odd thing is, on my old box, I used gpu rendering all the time; since I rebuilt this last october, I've rarely used gpu rendering at all.  My entire D|S/Poser/Reality/Luxrender learning curve has stalled out the last few months.  The demands on my imagination in school are just so high that I don't have a lot left for rendering other than the infrequent "nekkid chick with background" render and those are getting a tad boring