http://www.asus.com/Motherboards/Intel_Socket_1155/P8Z68V_LE/
http://www.asus.com/Motherboards/Intel_Socket_1155/P8Z68V_PROGEN3/
Note both the "Overview" and "Specifications" tabs. Basically it boils down to level of features. Quality is the same. You just need to decide if you need/want the extra features of the higher end board.