I agree with that, fixed dropouts weren't even standard 30 years ago. Another very simple option is to get any old frame with a hanger and put a chain tensioner on it. That would allow you to run fixed, deraileur or IGF with the same junk frame.

http://surlybikes.com/parts/singleator/

http://bike.shimano.com/publish/cont.../0/alfine.html

Or something like this:

http://www.jensonusa.com/store/produ...+Dropouts.aspx