Thanks to all for the tips.
If it doesn't need a specific derailleur, then I'll just get the cheapest thing that I can find.
I'm not an avid cyclist so the higher dollar name brand items don't really appeal to me. But I certainly believe that you get what you pay for.
The bicycles came off of an apartment complex where they have been abandoned and unclaimed for possibly 2 years. I'm going to patch together as many as I can and give them to some of our many homeless people within our inner city. For the most part, I'm only having to buy inner tubes. I've been able to work everything else loose with the ol' oil can.
Thanks again!
Jeff