The title says it all, I want to crossfire two R9 280x(s) on Asrock z77 motherboard on a HAF 922 case. I prefer ASUS, Sapphire, XFX for cards or MSI and Gigabyte if I have to, nothing other than those. (no Dimond, HIS, VisionTek or Power Color crap )
Just make sure your motherboard can fit the cards. Some of the Asus models are triple-slot form factor, and you might not be able to get two of those on some motherboards.