OK, I've read the articles posted. They all had DSP systems though, I don't have DSP, so would I be bypassing the stock amp all together or tap into the output of the stock amp? Also, since mine is a 2003, I should have the AUX in connector on the back of the NAVI correct?
I'm just leary of spending the money to setup the factory Sirius equipment to not be happy with the SQ of the stock setup and have $500 of BMW satellite equipment.

Basically if I can get a single DVD player up front, possibly a 1/2 din setup in the console possibly and sirius I'll be happy if it sounds good.