I know Scan do sell Asrock mobos but they never seem to appear on Today Only and aren't even an option on the OC bundles, any reason why?
I think the Extreme 4/6 and OC models would go well with some of the other components already chosen.
PS As an aside, why not go the whole hog and offer a 'case' option (alongside PSU, GFX card and OS), it'd make shipping easier and safer too I'd have thought.