Thanks for the links, they'll be very valuable tools.

As far as quality, I'm not quite looking for it. I rode the Murray for a few years before it broke and the only money I need to put in it is for the pedals, I'll shop around for a cheap one. The Bromleigh has sentimental value, it just needs a tune up. The Roadmaster is in pretty good condition. I've been riding that one around but it could use a tune up. Now the Huffy could turn into a money-pit, but I'm not going to let that happen. If I can't repair the parts that need fixed, and I price out the repairs to be too high for my budget, then there is a guy down the street from me who might buy it from me for the price I paid. If it's not too expensive, it's a fun little project. Most importantly, these are bikes I already have and it'll be easier than finding others.