There's been considerable movement to just get rid of the 3.3v and 5v lines from power supplies anyways. Newer motherboards are being built with the ability to

There's been considerable movement to just get rid of the 3.3v and 5v lines from power supplies anyways. Newer motherboards are being built with the ability to just take 12v and convert it on board, essentially the circuitry on that miniPSU you linked.