well so far you've specified only 2 choices, no oc and no multi card. i still suggest you pick up an oc-capable motherboard - a z68 mobo so that you can use oc later if you change your mind. if you don't need cf/sli you can get a micro atx motherboard. are you okay with that? most atx motherboards offer minimal cfx/sli like x16+x4.
what is your budget for the motherboard?
atx or micro atx?
how many ram slots?
how many pcie slots?
do you want built in video outputs?
do you want pcie 3.0 capability?