The #6 model drive that I posted is made by MHZ-Modelbau of Germany . If you click on the "Produkte" tab, it will show you the good stuff. Drives are listed under "Antriebe" and are very,very impressive - miniature Pulse Drives, #6 drives, TriMax/Arnesons, jet drives, and even one that looks like a single-prop version of a BlackHawk!
I don't know where BajaDave got his cable-drive #6's, but they look even more realistic from above water, and may be more durable (simpler).
Good sites are:
RumRunners for fast electric (low-aggravation) stuff.
Precision in Perfection for awesome large-scale cats, Apaches, Super Hawaii's, and Arneson drives.
Aeromarine Laminates for US-style offshore boats and hardware.
Graupner for BatBoats, Phantoms, SuperHawaiis and others, all imported by Hobby-Lobby . (Both sites are kind of hard to find the boat stuff in - be persistent, and check "New Items" in the Graupner site.)
Jim's R/C Boating page has tons of links - you can get lost for hours there.
Remember - Christmas is coming, and you'll need soemthing to do while it's cold out....