Lots of help you people are
My company uses Verizon for the company phones so I know they come in decently in South County. Problem is, I'll be moving up near the 55 sooner (or later). I think reception is all the same these days, even my Cingular reception is decent (but their customer service...).
T-Mobile is a new contender in my choices, Euro and NA are the first I speak to on a regular basis who have it. I do know it comes in well in south county though.
Decisions, decisions.