Yeah, definitely .ogg... Just pick one here: http://www.google.com/search?c ... amp;ie=utf-8&oe=utf-8
Winamp sucks! It was good before AOL buyd it. It takes very much CPU. Backround applications may also ruin your race. If you really want to use backround application: www.foobar2000.com
program called dBpoweramp does the job, but if your MP3 is too big LFS won't read the .Oggvorbis and will not be playable