Single gtx460 or crossfire 5770's?

So i recently purchased a GTX460 and am happy with it so far, but i needed to upgrade my motherboard to better support the phenom i purchased, best board i could find for the money was a crossfire board, so im curious if anyone thinks which would be better, a single gtx460, or 2 5770's? (i get a good deal on the 5770's at my work)

5770's crossfire is basically a 5870 which kills a GTX 460. If you can try to get a GTX 560 or a stronger single GPU, but if you can get a real good deal on the 5770's then go for that.

single stronger card than two lesser cards for me...id save money and get a 560 Ti... but thats my two cents. i like nvidia's drivers more than ati's