I have the Sansa 4G mp3 player with the mini-disc expansion slot...and I love it! It was (relatively) inexpensive, it can still play videos if I choose to watch them (rarely)...I have all the features that I truly enjoy - including being able to listen to the radio (mmm...Minnesota Public Radio!) and it supports playlists. I don't mind having to switch music out every now and again, either :)

And as the other commenter mentioned - I needed something linux compatible :)