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Right now intel is preferred as not many games (if there exist any) have been optimized to take advantage of the Piledriver's 8 core architecture. That being said, the next generation's console (both the x-box 720 and ps4) will be powered by a 8 core processor developed by AMD, so it's difficult...
Nvidia has just dispatched their new GTX 650ti Boost to counter AMD's release of HD 7790 in the battlefield of mid range cards. As the name suggests it's an stepped up version of the 650ti and a 2GB version is available. Perhaps this is a card that OP may want to consider looking into.
The biggest bottleneck of a gaming rig is often the video card and this is exactly the case in your configuration. I'd suggest replacing the i7 cpu with a less powerful i5 cpu, because frankly speaking, the extra processing power of the i7 isn't needed when it comes to gaming. This should give...
Probably an i5 processor paired with a b75 motherboard, which cost about US$250 in total. You might also wanna consider bumping the RAM to 8gb, as 4gb can be insufficient when you have multiple processes running, not to mention video editing demands a fair bit of RAM as well.
I've read an article that measures the performance gain by running two Vectors in RAID0. Here're the benchmarks:
http://www.hkepc.com/database/images/2013/03/source/07173603631749410842.png
http://www.hkepc.com/database/images/2013/03/source/0717360565413850920.png
Practically speaking...