Get an xfire 790GX MOBO ($100) with a phenom II x4-955 ($150) and a cheap HD5850 ($280).
I also need to get ram. Actually that's similar to the build I was thinking last night except to even cut costs more, I went with the phenom II x3 rana 3.0 chip. Would this be a good option since I need to cut costs to get the ram. Or should I get a cheaper video card for the ram and stick with the deneb chip. all of this will work fine on my psu also right?