I am doing a new build and have never done one before. Im not sure how to figure out if the motherboards im looking at will be big enough for the case im getting. Im getting the NZXT Phantom full tower, and all of this is from Newegg.com. The two motherboards im looking at are ASUS P8H77-V LGA 1155 Intel H77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard. And the other is ASRock Z77 Extreme6 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard. The Asus is cheaper and had better reviews and would like to save money if it is the right size i need. Please help me