IMO - the best watch site for collectors to learn about, talk about and buy and sell fine time pieces is...
www.timezone.com
Every brand has it's own forum and there are 2 selling areas as well - one for below $5K and one for over $5K
Do your research - When you buy one of these (or other brands) right, the value will continue to rise.
There are many brands that I like better than a Rolex for the money - Look at what's available in Glashuette, Panerai, Omega, J&L
Have fun with your research!