i will go ahead and say the asrock killer or the asus m5a99fx pro r2.0 both are good choices and have close to the same build quality. the specs lean towards the asrock but in reality they are very close over all. if budget matters asus if not spend a bit more and get the asrock. either way you get a killer board and will have a damn fine platform for your 8350. best of luck and happy building.
It's not the 990FX chipset that provides the USB 3.0 ports, but the ASMedia controller (same with the 970 chipset, or with the southbridge SB950 chipset). There's no native USB 3.0 controller on the AM3 platform.