Well, all agreeing than that the 6870 is better
, it's all way off topic ; the op maybe wants to sli and can't crossfire. So he def. has to go with NVidea, therefore a 460 or 560 but we can't tell without knowing other specs and res.
Ok, just saw now that the op only can sli. Was focused on the statement that a 460 is cheaper and faster. Get a GTX560 imo and sli that in the future.
Whats your system specs btw ( cpu, psu, ram, resolution ), maybe a 560 or 460 is overkill anyway.
Soooooo . . .
And yes ; yours was more detailed. I didn't go there allready because we don't know nothing. No need to tell all this detail if it's maybe not neccasary.
And even a good 450Wpsu won't be able to handle sli and that is maybe what the op wants in the future.