is there a reason you insist on no amp or bypass? this limits your choices significantly.
you could easily tape them up and itll look just fine as a wire loom.
anyways, check out eclipse, they have some classy looking radio's and I believe the 8 series or the top 8 series has no internal amp. cant change the color, but its black and white with silver trim, so no wories about it not matching in a tacky way.
if you can sacrifice three sets of outputs there is a rockford fosgate unit built by denon, its usually referred to as the denford unit. RF 8250, has digital RCA or SPDIF inputs, TWO but not three sets of outputs, and no internal amp. sexy copper chassis, too. and you chan change the color to green or amber/orange/red kinda color.
might be worth checking out too.