dudeguzman :
Nice. Thanks for all your imput.
So do you own a 6990?
I own a 6990 and a HP LP3065 1600p display. They are an awesome combination, highly recommended. I can play BF3 with mostly ultra settings and a couple of things set on high, though strictly no AA, and get between 50-90 FPS, with an average of 60+. I would not be satisfied playing BF3 with less than 60 FPS. At 1600p you don't need AA, the detail is extraordinary anyway. All the other settings, such as AO, are set to max.
I don't feel I need to add another 6970 (3-way Xfire) to achieve a very good frame rate for BF3, or Skyrim. Yeah, the 6990 runs hot, and it's pretty noisy (compared to the 5870 it replaced), but you can't hear it over the dull roar of explosions and gunfire in BF3.
My specs:
Asus P6T Deluxe
i7 920 @ 3.6Ghz
6Gb 1333 RAM
AMD 6990
2 x 1Tb HDD