That Good Housekeeping is only going to be as strong as a belt-driven machine can be. The stronger machines have potted motors and are gear driven, rather than belt driven. Look for a Singer 201 or 301.
I know it's exciting to find such good deals, but ask yourself these questions:
* Do I have room for it?
* Am I willing to spend the time on it to clean it up and service it and find it a good home?
* Do I need it?
Remember, the things we own actually own us. Do you have time to take care of these machines, or might you rather be quilting?