well...PPro CC 2014 NOW makes better use of memory.....32 GB is what Eric, ( here on the forum and computer builder for video editing at ADK), recommends as a minimum. Even on my Haswell laptop...there is a difference...i am using 24 GB.
I see Asus MOBOs frequently in use by the serious guys here. Make sure your power supply will be adequate UNDER FULL LOAD. Example : the new Haswell E has a "TDP" of 140 watts...HOWEVER, overclocked at 4.5Ghz, it draws between 3 and 4 HUNDRED WATTS ALONE !!! Add the GPU and that's a good load !! Make sure you read Eric's postings here regarding the performance of the Haswell E and how it compares to your chip....also, Anand Tech did a thorough comparison with your 4790K and the Haswell E and other CPUs, so you would know what to expect when you test your new machine on the PPBM 7 website, to make sure its running right.