I had uninstalled Google Music because of it's app size, but now that I'm rooted I'll reinstall. "Link2SD" will move almost everything to SD. I just reinstalled GM, my free memory went from 105.5mb to 104.9mb, it's linked to SD.
Just not sure if I like GM, When I sync my music, GM doesn't seem to get every album right. Probably bad ID3 tags to start with, but my other phone player (Cubed) doesn't seem to have a problem.