Is there a reason all the current USB 3.0 motherboards also have USB 2.0? With 3.0 being adopted by all the big players and being backwards compatible to 2.0, I don't see a reason for the 2.0 ports to persist. I would almost certainly give preference to a board 6 or more 3.0 ports over 2-4 3.0 & 4 or more 2.0 ports, all else being equal.