I think there are plenty of good SS machines available.. even on pinside... for reasonable.
Heck My Buck Rogers is still for sale, although I have someone coming by thursday to look at it.
I have seen recently some tasty B list titles sitting for sale in the mid teens.
Dont expect to get an A list title for little coin though. But you dont need an A list title to enjoy pinball.
Nothing wrong with a Nice Gottlieb System 1 machine If you want something cheap to learn on.