Four sticks in this MOBO does not make much sense.
I just built a system with this MOBO and a 930, it can handle dual channel, but it is really a triple channel board.
If you're willing to get a triple channel board and pay for more than two sticks, three (or six) makes more sense than four. Triple channel is faster and it you go dual you're dooming your board to run slower than it can.
Besides, three sticks of 2 gb will give you 6 gb total which is all you need, plus you can always add another three sticks to go to 12 gb if you'd like.
I recommend getting the corsair dominator memory. My build went together flawlessly, the whole thing took 2 hours. The corsair memory worked right away, I just went into the bios to enable xms and it ran at 1600 no prob.
Avoid the 'on sale' ocz memory with this board, I have seen many posts from people having all sorts of problems and having to pay for mailing back stuff.
BTW, I also recommend a modular psu (I used the corsair 750hw), my build is so clean with just five cables from the psu.