Generally if you have the bose system you should replace the whole thing, the bose is specifically tuned to the speakers, which run at weird ohm ratings compared to normal speakers.

If it were me, I'd look into some nice MB Quart speakers or something of similar quality, a good headunit and replacement cd changer to go with it, all mounted in factory area's, so it can be returned back to factory system if sold.

I hate factory car stereo's in most cars, I find aftermarket allows you to gett he sound you really want.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon