All looks great, but you should really look into an audio interface. Even the cheaper M-Audio's will blow that out of the water!
It's the number of OUTPUTS you will gain though. If you are running something like the Alpine H800 (which to me defeats the purpose of a carpc) then you would not notice a difference!Everyone seems to say go with an external DAC of sorts. I'm having an incredibly difficult time justifying one as most of my music is ripped MP3. I do play FLAC, but not often enough to justify going the extra mile for that last 1%. I do, however, need something that is 5.1 capable as I am doing in-car surround sound. I guess I'm just wondering if it is worth it.