Got the wave radio with factory fitted changer in the boot. It works fine, but the sound could be better, so if you're a hifi fan look to replace the bog standard head unit as recommended elsewhere.
Don't know much about the autochanger though. Are there any real differences between one 6-disc autochanger and another? Doesn't the real impact on sound come from the head unit / amps / speakers? (In no particular order).
If so, then £235 for the standard autochanger ain't too bad to give you something to use before you can get the other doo-dads.