looking into 512 - 1G, less than $150. not wanting to jump into the big into the big boys yet, 'cause i just need something for downtime between classes right now. on top of my list is the iPod Shuffle, but i'm looking into a second option. i like the super simplicity of the Shuffle. but that's irrelevent here and now. does anyone have experience with the 3 mentioned in the title, iAudio5, U2, and MuVo? or is anyone able to give a decent review? i'd like to get some feedback (and i forgot what that forum was the gets mentioned when this topic comes up). what i'm looking for: - good battery life - good sound - ability to push through Grado SR-60s - simple controls - an equalizer isn't neccessary, but it'd be cool if there was one. not those pre-set sound things (i'm not a big fan of these), but an actual equalizer. - don't care about FM tuning, ability to record, etc. i just want to listen to muzak.