Yup, the choices are stark.
If you are handy with a saw, then pick up a suitable second hand donor scope and have a go. SDM/Obsession scopes are based on a fully published design:
http://www.amazon.com/Dobsonian-Tele.../dp/0943396557
Otherwise, I guess that a man with a box full of Naglers ain't going to be happy with a wobbly lightbridge. You are just going to have to sell your car and buy an SDM
