I got the 16gb of ram for the same price as 8gb this week as the shop had a special on items if the system was ordered before friday . I do alot of video editing for weddings etc aswell. Don't know if thatd help. If i was paying for it then I'd be ott? Cool man, im sure they maybe marking up somewhere.
Depending on the OS you're using - 32bit or 64bit - the more and fastest is the best line of conduct for nowadays AAA games running on 64bit OSs (Win 7, 8 and 10 for example)
32bit OS can handle a max of 3.5GB
Power supply is never big and tough enough, you'll be using it after several years of upgrades. I prefer the modular type for cleaner appearance and ease of use. 1000 Watts should be a minimum, especially to handle video card(s).
[Edited by B4Marc, 12/10/2014 9:54:02 AM]