You can get a ASRock H77 Pro4 with the option of CFX later.
Also, if you want to Crossfire later definitely get a better power supply. A good 750W should do just fine.
You CANNOT crossfire on a motherboard with an H77 chip set . You can crossfire X , where the second card is in a slot with x4 bandwidth . Performance would take a serious hit
The OP should buy a Z77 chip set motherboard
He should also check that the RAM he has selected is rated for 1.5 volt operation
I wouldnt be a fan of the CM power supply either , but the spec's seem OK ... if the'yre telling the truth this time