I used to encode my music in WMA.
But after a run of spectrum analyses with CoolEdit Pro, I no longer use WMA any more. With 80Kb/s bitrate, all signal higher than 10KHz has been brutely trimmed! So, treble in WMA sucks. Ogg should be a better choice, if you wanna shrink the file size. For higher bitrates, it is said that MPC (MusePack?) is the best, among lossy codecs.