I'm not sure what you think I'm doing wrong, so ill write out my justifications for each of my parts:
Case/PSU - I go to a lot of LAN parties and have a rather small amount of desk space, so a cool little ITX build will do wonders for both
Mobo - Legendary ASUS reliability combined with all the features I need (M.2, overclocking), but not the overkill Maximus
RAM - I like to use a lot of programs in the background while gaming, so 16GB is the way to go.
Storage - My current 250GB SSD always seems to be full, so I went with a larger one. As mentioned I play a wide range of games so a mechanical drive is necessary for mass storage.
CPU/Cooling - I dont do any heavily threaded tasks (photo/video editing, ect), the only demanding task for this PC will be gaming. Therefore I thought the i5 4690 should be sufficient. I am hesitant to buy the k model and overclock due to the restricted airflow in the slim case. This could be solved with a 120mm AIO liquid cooler, if necessary.
GPU - The upcomming 980ti was chosen for its (rumoured) incredible performance, which should be my best bet for driving the massive 4320 by 1200 90hz display on the Rift.
It isn't my intention to purchase this system immediately, I plan to wait 2-3 months for prices to settle after the new GPU launches.
My question was a simple one: Will the listed system drive the highest possible FPS, or would I be better suited buying a 980 instead, and using the savings overclocking a 4790k with an AIO liquid cooler. The two options are roughly the same price, but one with a heavier focus on GPU and one with a focus on CPU.