I just picked up a 20GB ipod this weekend and spent yesterday loading cd's on (currently have 943 tracks which takes up 3.6GB and gives me 2.4 days of unrepeated music!).
I spent today hooking it up to my car and mounting it and I have to say it's by far my best investment in my stereo so far. The sound quality is great (I'm using the 3mm input on the HU and the 3mm output that's on the Belkin car charger). So if you're thinking about buying a cd changer or something, I'd highly recommend just getting an ipod. The way it categorizes music, lets you rate songs, create playlists, etc makes it so worth it.
~~~~~~~~~~~~~~~~~~~~~~~ '99 Eclipse GS-T HRC Stage II w/walboro 155lph, 30# injectors Clarion AutoPC 310C Avionixx DEI Viper IDQ12