I hear this audio player, Xion (
http://xion.r2.com.au) is very good and light. I have it myself and the equalizer can improve the sound quality by a lot (in comparison to windows media player). Fully customizable skin, and a neat thing about the skin is... creating your own skin has never been easier. just create the design in Photoshop, save it as a .psd file and use it!