Back in 2001 I got an Aiwa MP3 CD car stereo... it was seriously great... the only part lacking was when you switch away from the mp3 cd and then u come back to it, it only remembers the song, not the exact time you left off, so you have to hear the song over again... that was my only complaint...
Now with my new honda, i got the factory installed cd mp3 player... this one is great... reads fast... remembers everything... but the freaking thing doesnt have a display... so i have hundreds of song, but nothing displays the name =P
mp3.com used to have a great guide to car stereo's but I Don't think they have it anymore =T