If you become a nutcase like me and end up flashing everything but the sexy neighbor, I would suggest transferring your APK's to your computer. Here is what you should start off with to become familiar with adb.
http://www.androidcentral.com/sdk-driver-root-oh-my
This is what you can can do to make it more streamlined in the future when you understand how to push and pull files.
Android Commander
This will way you will have a nice tidy place to store access APK's on your computer when you fill your phone to the brim but dont want to delete them