best SLI or CF for a compact liquid pc?

[xman01]

I'm pretty sure a single 6870, 6850, and even GTX 460 1gb can play most games as 1920x1200... I'm still on a GTX 260-216 and I play everything at 1920x1200, I just don't enable AA and AF in newer games...

i run 1920x1080 with a 4870 512mb with all my games
jus 2xaa 4xaf, sometimes jus 2xaf alone

so a 6870 should be more than enough