RNS-E, with 2, 2gig sd cards.

 

Just get a casette adapter. I upgraded my stereo (subwoofers), but not the deck as it still has the tape (that would be like downgrading if I got just a cd deck). I was at first going to purchase an fm transmitter for my mp3 player, but the guy in store showed me the casette adapter. I play my mp3 player all the time in it.

 

Ya man Cassette adapter +1

Its cheap, easy, and sounds great. If you get fuzz sound its because your mp3 player isn't turne up enough. After that it sounds awesome, especially if your mp3 player has its own equalizer.