You guys are absolutely right, a 960 could probably be enough, but quite frankly, I'd much rather get the 4GB VRAM, and the 960s don't come with that (which may change shortly, but another story as such). I don't mind spending the extra $100 or so for that.
As far as compatibility goes, I've actually tested that at a buddy's house. He has a 970 in his main PC as well and we got 3 samsung 28" 4K monitors from Best Buy (and returned them subsequently) to test with. The card was fine with three 4K displays at 60Hz.
As far as monitor sizes go, I'm still struggling. I may just have to get one 27" and one 32" to tinker with first and return the one that doesn't make the cut, and order two more of the other.
As far as compatibility goes, I've actually tested that at a buddy's house. He has a 970 in his main PC as well and we got 3 samsung 28" 4K monitors from Best Buy (and returned them subsequently) to test with. The card was fine with three 4K displays at 60Hz.
As far as monitor sizes go, I'm still struggling. I may just have to get one 27" and one 32" to tinker with first and return the one that doesn't make the cut, and order two more of the other.