I agree with Potatoking, go with the 4790 for your CPU.
I think Nvidia's ShadowPlay may prove to be a very useful in-game recording feature and you're a CUDA fan, so we can take AMD off the table. That leaves either the 780 or 780Ti. At 1080p, the Ti is overkill and the price v. performance (especially non-overclocked performance) isn't justified, so I'd advise an incremental approach with a 780 that you can sell and replace in a year or so with a mid to high-end Maxwell once the tech is mature and prices stabilize. But, if you don't want to deal with the hassle of flipping the 780, go with the Ti and call it a day.
With a 4790, 780Ti, and everything else, your gaming load will be roughly 330 - 400w depending on the card and the game, so I'd grab either the
Seasonic G 550 or the
Corsair RM 550.
Do not try to save money on a PSU and don't listen to meatheads who tell you that you need more wattage for a single Nvidia GPU.
Any $150-250 USD Z97 motherboard will suit your needs perfectly, so take your pick, but...
Most importantly, I really think you should make some inquiries about which companies have a well-oiled Italian (ah, stereotypes) RMA process and let that heavily influence your GPU and motherboard purchases.
The Cooler Master Hyper 212 EVO is always a CPU cooling crowdpleaser, but someone else will have to chime in about any RAM clearance issues that may exist. The other option is a 120mm AIO and the Corsair H60 is a good choice. You're not pumping high voltages to stabilize overclocks, so heat should not be a problem either way with any remotely decent case.
We've sorted the RAM, the case is in the eye of the beholder, so on to storage.
You will appreciate a Samsung EVO SSD for the quick boot and program/game load times. Let the size of the programs you use and how frequently you want to have to move games off it determine the capacity.
A single HDD, 2 drives in RAID 1, and with or without an external backup are your basic options for the video intensive part of the equation. I'd use WD Black or RE 2TB drives(s) in RAID 1 along with a backup, but I'm a paranoid lunatic.
Don't know what else to tell ya; enjoy your new toy.