Okay, if I were to go for 1080p max instead, what would be a good choice? I've seen stuff like the ROG MARS 760 and POSEIDON 780 but that might be overkill? I don't know.
And my budget can go as high as $650
I would go for one of the 780's with that budget. Or if you don't mind running an AMD card, a 290X would be a good fit for the budget.
OR if you don't mind stepping up a little bit, the GTX 780 Ti would be the most futureproof option, but the price is around $700. The EVGA 780 Ti SC w/ ACX just recently dropped to $709 on amazon, that's the one I picked up. I'm very satisfied with it. Crushes just about everything at 1080p. he most demanding game I own, BF4, gets a solid 65+ fps, average around 85. Amazon offers 12 month no-interest financing for large purchases...