Densweep, you sure have a point there. I am very happy with my 5770, goes very well, plus having it in Crossfire would be pretty sweet,
Frank007, the 4890 and 5770 are basically on par with each other as far as I know, I would say they are about the same, 4890 has slightly more grunt. Of course, I could be wrong
2x 5970's is overkill and would set you back around R13000. You also cant really compare them that way, its fairly obvious that 2/3x 5970 would beat a single 6000 series card, but that means that if you have a fast 6000 series card, crossfired, it would beat the two 5970, all relative.
a 5870 or 2x 5870's is a really nice setup, but of course it has a price tag of around R9000