Quoted from arpman:
You might want to try and get one of these machines. They are all projects, so you can get some experience with maintenance. The good ones you are looking for have already been sold, but there are still some good machines to acquire as a "first pin" to increase your knowledge level.
[EDIT] - here is the link - https://pinside.com/pinball/forum/topic/for-sale-time-to-thin-the-heard-project-pins
Looks like he's sold everything except the Xenon which doesn't have a price yet.
I'd recommend against a "project" machine for a first pin given that OP's main interest is playing and figuring out if his family enjoys playing. If he's sinking many hours into repairs and it's not quickly playable could poison the well with his wife (or himself for that matter). I'd recommend paying a bit more for a fully functional game the first time out.