I finally got my mp3 cd player after waiting for 2 months due to its travel from Japan! The sound is way better than the 6 disc changer and it does go with the bose system. The only thing that sucks is the names of the artists don't scrol by themselves, you have to do it!
I bought the mp3 player and it is an in-dash mp3 players that reads from cd's and it takes the place of the in-dash 6 cd player, the two are seperate and are not combined together.
I had the same speakers and I hooked them up to a MTX Thunder T4244 400 Watt amp with the infinity 605's and 6 x 9's, the sound was great and made a big difference.