Default How to upgrade from 4.1.2 without losing carrier unlock?

I purchased a carrier unlocked Verizon Samsung Galaxy Note II. Can anyone point me in the direction of how to flash a Jelly Bean or KitKat rom on this device without losing the carrier unlock? I am currently using this on a GSM network (Cricket). I managed to do enough searching to get it rooted using Framaroot. But I'm not exactly sure what my next step is. It seems like many of the roms are Verizon specific...but I could be mistaken. I'm sure some of you have been through this before...and I'm a total newb to this device and carrier. I'm pretty decent with using ADB, Odin, etc. I just don't want to brick this thing just to upgrade the Android Version.