LG has a great developer community, too. Cloudy keeps his Stock roms well set up, so if you don't want that G2 UI then you can swap it for a G4 UI with G2 software features.
AOSP roms are good, aswell. I run SlimSaber on my phone with no trouble. Beware, though as some panels might cause a white screen issue, so check what panel you get before you do any software things