They're both nice boxes for OS9 since you have a decent amount of ram. Performance should be excellent in OS9 too. They're not practical for OSX so they have very limited appeal these days.
Resale value is zilch. The only people willing to spend money on these boxes probably need it to run older software. They'd buy it as a hardware backup. I think $50 would be very optimistic. You're probably better off giving them away now and making someone happy, cause next year you'll have to pay someone to dispose of them.
Real Macsters don't repair permissions.
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