Over here in the UK, one of the most respected vintage Rolex collectors/dealers has launched a new website. I've purchased from him a number of times and the pieces were exceptional. He is certainly worth adding to your list in my opinion!
Jason Graham aka 964RS on many of the forums - his website is
www.SweepingHand.co.uk
You can also keep upto date with his available watches or just drool over the pictures on his facebook page at:
www.facebook.com/SweepingHand.co.uk