Diggi did raise a good point with an AMD build, they are cost-effective. Unfortunately, their x86 performance, and the FX line in general, is a bit lower-end when compared to the upper end of the Haswell line. If the programs you use for video editing are highly threaded and they prefer physical cores over Intel's HyperThreading, a high-end FX CPU could be a viable option.
I just looked at Diggi's Intel build, the case chosen is a full-ATX so it should hold almost any GPU, reviews on Newegg indicate it is able to fit a GTX 780, so an R9 270 would fit. The NZXT is a little lower-end and the side window may make it more noisy, but the case should work if you want to save money. There are some differences between that one and the build I created, mainly with the GPU and water cooling. Up the GPU on Diggi's Intel build and you will have one very similar to mine in terms of performance. The AMD build is the same as the Intel with the hardware selection, but with an FX CPU and an AMD 990FX motherboard.
A little backstory with the motherboard. ASRock used to be the OEM budget line for the parent company of Asus, Pegatron. ASRock boards were meant to compete with the high-volume OEM market, kind of like Foxconn. Over the years, ASRock has grown popular for their budget conscious boards. Some DIY builders report that ASRock does make thin motherboards and many prefer Asus for their higher quality. MSI is a step up, but Asus and Gigabyte are viewed by many to be at the top of preferred motherboards. If you are interested in those boards for your Intel build, I would suggest either the ASUS MAXIMUS VI HERO or the GIGABYTE GA-Z87X-UD4H.