Will your city be 4g capable first of all? If not, then there really is no point in getting the Thunderbolt, imo.
I'm not going to lie, the iPhone is one hell of a device. Is it the device for me? No it's not, otherwise I would've stuck with AT&T. I like to think of it as a "dumb smartphone". It's got the great app support, but it definitely isn't as "free" as Android.
Have you checked out any other phones in the Droid lineup?