All configurations show a very weak 600W PSU and only 1 x 8GB memory and a mid tower.
See Tweakers Page - What kind of PC to use? why you should opt for a better PSU (at least 750W Gold label) and why a big tower.
For memory use at least 4GB per physical core, so 16 GB for quad cores and 24 GB for hexa cores as minimum. 8GB is not enough.
Using only a single DIMM module is not advised. With dual channel architecture use multiples of two DIMM modules, with triple channel use multiples of three modules and with quad channel use multiples of four modules.
Overclocking is easy and the cheapest way to get better performance, because it is free. Have a look at New System Build for some ideas and considerations.
Thank you for the great advice! I've built two PCs yet had absolutely no idea about RAM channels, so such advice is absolutely golden. I was a bit shaky about the PSU too, so I've taken it into consideration! I've updated my build with extra RAM and a new PSU, as well as updating the Kingston to a Samsung drive.
i7 4790k: http://pcpartpicker.com/p/DzH2P6
I think all things considered a 5820k Build is just way out of my range. The i7-6700k I may consider depending on when I actually buy the PC (likely 2 to 3 months time) as the price of it and DDR4/Mobos may drop dramatically post Christmas.
So, the question that remains for me is whether this build could conceivably edit offline 4k footage or something like 2.5k footage online. For example, I read the What Kind of PC to use? thread and it states a six core for stuff like ProRes 422/AVCHD. I have acquaintances who have said they have comfortably edited 2.5k footage for a fast cut, effects laden music videos on an i7 Mac laptop for example, whereas some internet proponents of spending upwards of $5000 on a PC have Vimeos full of nothing but one camera, one track work that I'm fairly certain I could comfortably render and export on my laptop now. I'm sorry if I sound arrogant or antagonistic, but I'm just wondering if there's anyone out there on something like i7 4790k who can tell me what day to day editing on is like.
the i7-4790k may be around 20-30% faster than an i7 laptop (depends on which i7 is in the laptop), so it should handle HD/2.5k projects. the 4k offline will depend on the proxies, they could be made into HD proxies if needed. the i7-6700k would be a better choice if possible, to get ddr4 and other next gen features.
if using proxies/offline, you might want to look into davinci resolves new built-in proxy system (optimized media). you may be able to edit and color inside resolve, using its proxies, then have resolve use the originals on export. built-in proxy systems have been around for a long time, but premiere is missing that and several other features.
for your i7-4790k build, a Z97 motherboard would have more options like multiple video cards and overclocking.
if you plan on doing alot of coloring in davinci resolve, you may want a gtx 970 for HD/2.5k projects.
the 250gb version ssd would be faster and last longer. the extra space can hold adobe's cache and resolves cache/db.
asrock and msi often allow for better features for their prices, but asus and gigabyte have the lowest failure rates.