Wait.
And in the meantime, go spend chump change (in comparison) and get an HTC Rezound off CL or somewhere.
Then you will have The ONLY phone that does 4G LTE, is World-capable, and will let you talk on the phone and surf the Web at the same time WHILE ON A 3G connection (notice, I said 3G - all the 4G phones can do simultaneous voice and data on a 4G connection). GS3 can't do that. Nexus can't do that.
And with the latest Global OTA that's out there (along with easy rooting and S-Off), the battery life on the Rezound kicks serious booty. Before the Global OTA, I used to get to bedtime without around 30% battery remaining on most days. Now, I often get to bedtime with more like 60% battery remaining.