Note that i did not include a CPU cooler because since the FX 8320 and FX 8350 are the same chips, you can overclock the FX 8320 to 4GHZ easily using the stock cooler.
its a $10 difference if you don't use the mail-in rebate (or if they don't give it to you). $5 is in the shipping for gigabyte.
My experience: gigabyte is simple user friendly, max oc on my chip was 4.4 ghz
Asus was a bit more complex in the bios but infinitely more options. same chip, 4.7 ghz.
also do not get windows 8. its designed for touch screens.