Ditch the rest: make it all up with classical! 
I have a Sansa Fuze MP3 player, it has 1 4Gb internal memory & a 8 Gb memory card. I listen to radio comedies and a mix of light rock, jazz & classical. I generally put some BBC R4 documentaries on it too. Saves the phone batteries and is very small and light. I bought my girlfriend a Sansa Ciip, it is even smaller and lighter but with more memory (8 Gb).
Worth investing in I think, it saves your phone battery and will probably produce a better quality sound (I have bose earplugs with mine).
Edited: 19/04/2012 at 00:05