If you haven't left already and still have your music CD's, you might want to consider using Exact Audio Copy at (
http://www.exactaudiocopy.de/ ) to rip your music into the FLAC format.
Unlike mp3 (or sony atrac, or the apple or msoft verions) this is a LOSSLESS compression format - like a zip file for audio. In other words, you do not lose any data at all when you rip to this, unlike mp3. It gives you a larger file size, but still decently smaller than the native wav file - and a decent 'mp3' player will also play this format directly (it's an open source format, widely supported. There are also lossless compression formats by Apple and others).
I have a Sonos system at home - so keep all my music in FLAC on my home desktop and stream that to my living room.
I use Media Monkey as my mp3 player and it can also play FLAC, but i use it to block convert all my FLAC to mp3 for me to take with me on my laptop and portable player.
Foobar is another useful tool/player for conversions....
Recommend looking at Sonos when you get to the US.