I just upgraded my stereo using the stock Bose head unit and it sounds pretty good. Tapping in to the inputs to the Bose amp yields decent sound. I'm using the following equipment:
- MB Quart QSD 216 6.5" components up front (a bit bright, but the sound is clean)
- MB Quart DKD 116 6.5" 2-ways for rear fill
- JL Audio 10w3d4 10" sub in a 4080 box
- JL Audio 500/5 amp powering everything
Hopefully, I can get the Nissan OEM iPod adapter installed in the next month or so.