Definitely go with Dark's second build. The 2 extra cores of the 5820k along with the DDR4 ram will really help in terms of editing and provide a boon in streaming as well. I like Asus as a mobo manufacturer better personally but MSI will do the job as well. If you want to save some money a 980 or 970, hell even a 960 will do ya fine for what you want to do.