GoldenEye Rom...

They are all scared over here with ROM's and MOD's. XDA is the place to be for all of that.

I'm sitll holding out for a formal bootloader unlock (not work around like loki) to do an official Google Edition Conversion. However it would appear this may never happen. QFuse? Really? LOL.

So I've also got an HTC One on the shelf, that already has an exact conversion process. Waiting to see if 4.3 is OTA to those who have already completed it, then i might have to abandon the S4 for now... It can sleep in a drawer for a while. I miss my Galaxy Nexus Experience. But I also don't do ROM's, I like stock official w/ root just the way it is.
 
I never used a custom ROM on my S3...and just last week tried out Goldeneye on my S4...my first ROM and I think it's GREAT. I have about 100 apps installed and the only ones not working are WatchESPN and DirectTV. Everything else is faster, smoother, better with quite a few sweet add-ons to improve upon it!