Azrael47 has good question, but in general what are you going to do with your rig and what CPU are you looking at - the third mobo has been discontinued, the second is an X58 and the first is a Z77, the two are different sockets and different CPU choices....regardless, unless all you are planning is basic computing, no OCing, etc then you prob want to look at a different brand, Intel brand mobo are rather staid entry level mobos