mike says:
Not sure if USB would deliver stuff in that good a quality
USB would transfer the data, which is digital, so will be exactly the same quality as the original MP3. The quality of the digital to analogue conversion is what's important, which for cheaper devices might not be as good as it could be.
I've not tried anything in this arena to be honest, most of the music I listen to these days is on a laptop at work or my iPod through headphones.