It's really your call on the motherboard. I've always used gigabyte and never had any issues. Obviously if you have a sidepanel window on your rig with some LEDs and stuff... the black/red of the Asus is going to look alot more bada$$ than the gigabyte baby blue cookie monster color.
For gaming... the 965 will be better b/c of the higher clocks. *if you really do alot of 'demanding' multitasking and editing, then the 6core will be beneficial. Of course demanding is a relative term. ultimately, they're both great processors. If gaming is your priority (and it sounds like it is), then go with the 965