apps and music? i have the LG Zenon and it has an okay battery but listening to music or using it a lot kills the battery fast so streaming music to bluetooth would kill the battery quick which would be annoying bc it has to last from 7am to 4pm (because im in high school and listen to music during school...) so im kinda leaning towards the new Zune HD 16gb but i cant decide! any help/opinions would be great 