Normally the ASUS is more expensive than the ASRock, but from Microcenter they will be about the same price, so assume they cost the same. I will stick it in an Antec 900 case with a 7970 GPU and a 750W PSU (On sale from newegg for the same price as an equivalent 650W). I will be overclocking both the CPU and GPU. I will have a Samsung 840 Pro SSD and a 1TB hard drive. I will be using ethernet and onboard audio. As for OS, I haven't decided yet (I can get Win7 and Win8 for free) but most likely Windows 7.
Anyone recommend me one over another? I've heard very conflicting opinions and I'm not sure which would be best for me.