When overclocking, the difference between a 70$ and a 200$ Z97 mainboard will be totally negligible, especially considering the 4790k as your CPU option.
Out-of-the-box, that CPU is already highly overclocked and often enough very close to the sweet spot and only stable at higher voltages. Wouldn't expect any results better than 4,5-4,6 GHz on all cores, unless you buy a pre-tested one.
GTX 980 = wasted money as well.
http://pcpartpicker.com/p/hBL4mGEdited the previous build a little to include a HDD.
Additional storage + less noise in red/black for less money as well.