O.K., so i've downloaded google play music manager on my Mac, and synced it with iTunes. Now if i download the google play music app to my SGSIII, i believe that i can remove the music folder(the one i created) from my ext sd card. That should free up over 12gbs. of usable space, allowing me to go for the N4. If all this makes sense to you, please let me know. Thanks.
EDIT: Sorry, but i don't think that this will work. All i'm doing is trading one music player for another one. Well, i hope that the N5 will offer a 32gb edition.