If you just need a wealth of info about Rolex watches, few places have as much well organized "scoop" in one place as does Bernard Watch. (
http://www.bernardwatch.com/Rolex-Model-Overview)
I just gave the link for the overview, but there're other pages well worth checking out. BW is also a reliable seller, as are many other places:
- Bob's Watches
- Alan Furman
- Jomashop
...and others.
All the best.