Be calm, you made the right choice. As you i was in the same position a few weeks ago, but decided to take the i7 4770k. For rendering (doesn't matter what, 3D or video or photoshop) it just has more power than the i5 - see for yourself: http://www.hardwareluxx.com/index.php/reviews/hardware/cpu/26405-haswell-test-intel-core-i7-4770k-and-i5-4670k.html?start=11
WITHOUT the professional work (rendering etc.) it's a different story. In that case the i5 would have more bang for the buck, and would perform quiet well like the i7 with overclocking. But that's it. I would consider the i5 only if i have to build a pc ONLY for gaming. As you described your situation - it's nothing you need... ;)
2400 RAM is sometimes better in case of overclocking (a bit more durable due to the fact that it is build for it), without it you could stick with 1600 RAM and save a few bucks. The 'speed' difference isn't there, except you are an overclocking nerd looking for the single frame more... As RAM is pretty cheap at the moment, i would buy 16 GB.
I have the 770 with 4GB. Good choice on the vRam - youn can never have enough, especially with multi monitor setups!
The Baracuda is good. But instead of the 1000W i would save some money, buy a 500 to 550 PSU and invest the rest in an 128 or 256 GB SSD. SSD's are a must have today, and are the BIGGEST time saver!
SSD = OS, programs, Games
HDD1 = Copy of files for editing, Cache (Photoshop)
HDD2 = Output renderings, recording files for editing
Don't be fooled by the GPU watts masseges, what nvidia tries to sell you. A normal System like you have with ONE! HDD, One good GPU and an overclocked CPU has no problems with 550W PSU. A good rule of thumb is to use above 800 W for SLI/Crossfire. Overything below will have good performance with 550 W. You only have to watch out for a good quality PSU. Nothing hurts more than frying your fresh system with a cheap PSU.
