The one that I'm using right now: A Motorola Razr V3i.
I could get and afford an iPhone, but I see zero reason to get one. I don't care for mobile high-tech toys and in my book, a phone is there for exactly one purpose: To make an outgoing phone call when necessary. I don't need or want it for anything else, and I don't like to be available all the time. Call it occupational hazard - I've been on 24/7 on call duty too often in my life.
I have an iPod Touch that I use in my car, but I use it as exclusively as a music player. I use a real computer for everything else.