I'm in similar situation with staying on Sprint waiting for LTE via second tier. The 3G is so terrible and I'm using WIMAX so I wish there is an in between speed or better 3G here. Plus, with the release of the quad-core LG Optimus G vs dual-core SIII, I'm not sure what to do now. $199 for the quad-core is not bad at all.
To each their own...