I'm pretty brand loyal, and I've been with Verizon since 1994 (I actually signed up with Airtouch, which was acquired by Verizon). Verizon's been good to me over the years, so I don't plan to change carriers any time soon.
I am looking at the Android though....
I'm a big Android fan and I prefer a great Android device over the iPhone. The HTC Nexus One should be out for Verizon in a month or so. That's one sweet device.