Good Build for 1440p?

Nice build but I recommend one more fan if you are overclocking your i7-4790K and there will also be a Crossfire another one.

More than enough fans come with the case. Nice build.

If it is included then that is more than enough to cool the earth down from global warming (terrible exaggeration).

That RAM has a latency of 10. 9 or 8 is better, but it's not a big deal. Also the case
Here's the RAM I'd go for personally: http://uk.pcpartpicker.com/part/corsair-memory-cmy16gx3m2a1866c9r
It has a higher frequency and lower timings.

Latency does, frequency not so much.

I know it's been "solved" but a few points:

1) All the R9-290/290X cards i've been carefully reviewing with customer comments have a lot more problems (likely heat related) than similar NVidia cards.

I started out WANTING to recommend a $400 R9-290 but the only card i even felt comfortable recommending cost $460 or almost the price of an EVGA GTX780 967MHz which has about the best reviews out there.

2) SLI works better than CROSSFIRE:
You can compare a few recent games and it looks like maybe they're similar but overall SLI is better.

*Note that DX9 support for Crossfire still is not working properly. AMD has reported fixing the RUNT issue is still on their "To Do" list. This issue means then 2nd GPU often produces minimal output so FRAPS reports 60FPS when you're seeing 30FPS effectively which is pretty crappy considering how much money you spent.

3) GTX870/880 cards are coming fairly soon.
They will likely beat the current AMD cards in both value and noise. Look at the GTX750Ti and we realize the new Maxwell GPU is very power efficient which translates into far less noise with a similar cooler.

The GTX880 is estimated to cost about $500 USD and perform similar to top-end GTX780Ti. Or perhaps SLI a 2xGTX870 setup...

4) Noctua cooler:
That's a great cooler, just make sure it FITS and doesn't impinge your top PCIe slot or memory. It did on some boards. The Noctua NH-U12S is a great cooler as well. I've tested it on the i7-3770K and i5-4670K at 4.2GHz and it was very quiet.

5) POWER SUPPLY:
As I'm recommending the GTX870/880, you'll be able to get away with far less power needed. Probably 850W will be plenty.

6) Monitor:
Probably a good monitor, just keep in mind that IPS does cause some ghosting. It's a tradeoff between slightly better color and viewing angles versus less ghosting on 1ms TN panels.

Summary:
I'm basically recommending you switch to an SLI setup with the new Maxwell cards. You can still buy the rest of the computer and use the iGPU or a spare video card while you wait.

2560x1440 gaming:
I have a high-res monitor and GTX680 graphics card. While I love it (Dell U2711) gaming at 1440p often doesn't look much different than at 1080p. Games like CRYSIS series for example look almost identical.

Games that DO look noticeably better have small HUD/Text elements and usually these are 3rd person or "god" games such as Torchlight, Diablo 3, Starcraft 2, CIV5 etc and luckily these all tend to work on MAX quality with only a GTX680/770 or less anyway.

*Thus, consider getting a single GTX880 card to start with and see if you really need a better card. Again, just game at 1080p for games you can't max at 2560x1440 60FPS..

NVIDIA:
Aside form G-Sync I forgot to mention:

PHYSX: You're missing out on some extra graphics in several games.

Shadowplay: record gameplay or desktop with minimal FPS impact (same feature also makes streaming gaming like the new Steam feature work better as it does real-time encoding of the video with the same NVENC hardware encoder).

TXAA: better AA when supported by game.

Sounds great, I agree SLI does work better than Crossfire.
The 800 series should be out within 2 months