I have set up two different builds on pcpartpicker.com. They are roughly around the same price but they have some major differences. I plan on doing a lot of gaming and I want to be able to play the top current games and next gen games on max settings with a 27' 1920x1080 monitor and may be adding a second 1600x900 monitor for browsing the web/streaming while always staying above 60 frames. Games I will be playing include: Planetside 2, Battlefield 3 and 4, Crysis 3, Watch Dogs, Bioshock Infinite and many others. I do plan on doing some video editing and stuff on Youtube but nothing too hardcore. Please help! Its driving me nuts!
My vote is for the 196LR (first link) with the dual GTX 770's. They will perform better than the single GTX 780 will. Plus the difference in performance from the 3.4Ghz i5 and the 3.5Ghz i7 won't be very much. At least not for gaming purposes.