Two words: needlessly expensive.
CPU: Since you've only sited gaming an i7 series CPU is overkill. Those extra logical cores are for the most part going to sit unused. Would recommend going with an i5 4670K instead.
CPU cooling: Unless you're doing extreme overclocking watercooling really isn't necessary. And frankly most folks that are into extreme overclocking go with custom water loops as opposed to the AIO units like the Corsair that you have. I would recommend going with a reliable air cooler such as the Hyper 212 EVO or another air cooler of choice.
Motherboard: It's not a bad board but really it's more overkill. If you really want it fine but I would recommend going with something along the lines of an AsRock Pro4, Gigabyte Z87X series or Asus Z87A type motherboard and work with one of those.
RAM: Decent amount of RAM but you'll never see the difference outside of a few benchmarks of DDR3-2133 vs DDR3-1600 RAM. Would recommend the same amount from a DDR3-1600 kit instead.
SSD: Fine (have one myself and quite happy with it)
HDD: Fine
GPU: If you prefer nVidia that's fine, nothing wrong with getting a GTX 780 Ti. However getting a pair of them for single monitor gaming at 1400p is overkill. If you were going for multiple high resolution screens then I wouldn't have a comment, as is you'd be served just fine by a single 780 Ti. Frankly SLi & CrossFire introduce their fair share of issues into gaming. So often folks have to wait for profiles to see the benefit of either tech and not all games are well optimized for it. So I'd recommend going with a single 780 Ti instead.
Case: Not bad, purely a matter of personal preference. I prefer the Fractal Define R4 in that price range but the NZXT Phantom isn't bad either.
PSU: Overkill. Even if you went with a pair of 780 Tis your total draw from your components at load is going to sit around 850 (edit: was originally 750 watts, remembered power draw for a 780 Ti incorrectly) watts. Like most other folks I recommend allowing for some overhead so I could understand an 950 watt PSU in that scenario. As is though the only time I would recommend a 1300 watt PSU would be if you were going with four 780 Ti video cards. I'd recommend going with a NEX 750 with the recommended changes if you want to stick with eVGA or a decent SeaSonic or Corsair PSU in the same wattage.
DVD-ROM: Dime a dozen so it's fine.
OS: Should be fine, not sure if you really need Pro for a gamer but if you need some of the additional features that's fine.