It is interesting. Location can make quite a difference to what carrier you choose.
I'd love to move from AT&T to Sprint and get that EVO. If I did, I'd have on in my hands this minute.
I live very near Sprint's home town, Kansas City. Coverage for Sprint for me is not that great. Have to be in a certain spot in my house to get reception; drops 2-3 different places on the freeway. Can't go to them.
I'm considering moving to Verizon, only due to finding a phone I want. But then I've read that GSM, overall, has advantages over CDSM. But who knows, maybe that's too much detail.