Jabby

So, I recently did a head over heels flip on my road bike (It was a disaster) and in the process completely wrecked my RD. So, I'm looking for a quality, inexpensive replacement I can get off of ebay or something. Most of my bike is from the mid 70's, but I recently replaced the rear wheel and cassette, so that's modern. I'll update this thread later tonight after I go check specifically what I've got back there. In the meantime, though, any tips/suggestions/whatever? I'm thinking of turning this into a project, actually, repainting her, cleaning her up, and generally just making her presentable again. She's got a lot of miles on her.