I see that you said you are interested in 4K, but I only see 1 GPU and no monitor. Then I see you posting about 1080p again? What's the goal here? Is that the upgrade path you want to take, or are you going all out right now?
If you're going all out right now, you'll need 2 980s to hit good framerates in anything demanding (BF4 is one of the most demanding games right now, barring Hardline, which I have no interest in, so I couldn't tell you if it's more so or not). I would also get the EVGA 750w G2 either way, as ED said before.
If you intend to upgrade later on, I wouldn't worry about getting ridiculous FPS right now, just get a cheapo 1080p 60hz monitor with decent response time (off brands can be found at a quite reasonable price), and splurge when you go 4k. Anything above 60FPS is going to be fine on that, and you won't have any problems at all hitting 60FPS.