Both are decent motherboards, but if your looking to save some money, Newegg almost always has 790gx motherboards in stock for under a 100. For my previous build i picked up a TA790gx A2+ Biostar 790gx motherboard for 60 bucks. In fact, these three mobos are absolutely awesome, and at a great discount. All the mobos ive ever bought have been open box btw, and they always work out great. The first one has 3 PCI-E slots! For the same price as the mobos you were looking at.
http://www.newegg.com/Product/Produc...2E16813136041R
http://www.newegg.com/Product/Produc...2E16813130136R
http://www.newegg.com/Product/Produc...2E16813130190R
http://www.newegg.com/Product/Produc...2E16813136041R
http://www.newegg.com/Product/Produc...2E16813130136R
http://www.newegg.com/Product/Produc...2E16813130190R