My grail is my 6263. I have always wanted one ever since I saw my grandfathers when I was a little kid. Now, I have his and it will never leave me or my family - ever!
If you are looking for a used watch, you can't go wrong with the search engine
www.watchrecon.com
It pulls in a ton of classifieds for new and used watches from a bunch of watch forums (TRF - The Rolex Forum, WUS - Watch U Seek).
Of course, you need to do your research to ensure you're dealing with a reputable person (references etc.), but can be a great tool to use to understand pricing of the market for a particular piece.
There are quite a few second hand dealers with stellar reputations advertising as well.