For older shows, I’d definitely consider MASH if your kids haven’t seen it. Also The West Wing - the politics of left and right and the global situation have hardly changed at all and both would give you lots to talk about.
If you like sci fi/fantasy I’d be willing to watch Firefly again, and Buffy the Vampire Slayer. Battlestar Gallactica is great except for the final episodes which stink.
Agree White Collar is great. The characters are fun and complicated. Also The Americans - so much to talk about there. It’s pretty cool that it is based on a real life case of embedded spies.