[MrObvious]

Good writeup. I know you didn't ask for coverage comparison but it's worth mentioning how GSM carriers typically cover the east coast and major cities and that's about it while CDMA carriers cover the nation much better. So if you live in a city you probably can go on GSM just fine while if you are in a more rural area or whatever you may want to stick with CDMA.

That said, getting coverage is about the most important thing I think.