loops - beat me to it when I was typing my posting...
GTX 560's in SLi beat a GTX 580 handily...
Does he need a 7870 when a 7850 kicks so much ass? He sells the 560 for 120, the 7850 goes for 230. Sell the silly games that come with the 7850 and you got a great card for not much out of pocket. OC that 7850 and enjoy. SLI later.
Here is a crappy pick of my rig's sli w/o much cable management:
I am happy in game and I will not change this set up. I'd guess that a 7850 CF would make me giddy. I dont shy away from sli or CF.