Mp3 pleying on z50

Hello folks, 
another unuseful question - myabe useful to get away some FUD about
buying a z50. 

The question is: how it the z50 for playing mp3 ?
I don't plan to use it as streaming server or so, i just would like to
know if i'll be able to play an mp3 file using a headset ?

I mean: will the mp3 player (mplayer? mpg321? mpg123? what would 
you use?) kill mi z50 getting it slow and unusable?

What if i use mp3s with a lower bitrate (max 64 kb/s) ?

Thanks, 
Emanuele Santoro

-- 
Un informatico val dal dottore. 
Dottore: - Dica trentatrè... 
Informatico: - 1 0 0 0 1