have you read the all-in-one pros/cons in the threads like the one linked to in my sig yet?
something that could be a major deciding factor is how it handles the sub output-- is it a fixed x-over? if you can control it, does it need special drivers?(i haven't seen many bad reviews on revosys, so i would expect this to be easily answered)
what kind of issues are you having with how to setup the pc to output to the amps?
i run a sound-quality based setup using a external soundcard, and have audio quality, and control that outpaces any headunit under $1200(not including the stuff when used with the external processor)..