I found these guys at the San Diego Comic-Book Convention-
A Star Wars fan-run group of stormtroopers, all with custom-made stormtrooper armor. Watching them in large units is really impressive- check out their pages of photos. There are garrisons all over the world- these guys could totally have their OWN convention.Web link of note: 501st Stormtrooper Legion
(At http://www.501st.com/)