iPhone 5 on AT&T for now, will get the 5S on Friday. Used to hate Apple, but after my first iPhone I became a convert. Love having all my music and pictures on one device, the only thing I would change is to have a microSD slot just in case I run out of room. So far only on my iPad have I had that issue.
AT&T will be the best network soon as they are supporting Onstar, will give T a huge requirement for availability.