Edge950
You can also get the head unit rebuilt. Most good stereo shops can handle the job. It should only take a couple of days and cost about $100 or so. Same for the amps. If you can get the door ones out they can be tested and repaired. I have had to do this several times with several of the C4 models we have owned.
I would prefer an aftermarket myself, especially if you enjoy listening to compact discs. I have four bose stereos in my shop. Don't even know why I am holding on to them. The Gold series with the cassett and disc in the 90 does an adequate job. It is very sensative and tends to pick up other electrical current from time to time and make whinny noises. I have had that head unit rebuilt twice, the control/receiver once, and replaced the rear speakers and amps. When it is working, it is a nice unit.
Good luck,
Chris