Probably Scooby-Doo, but there were a lot of cartoons I enjoyed as a kid. Darkwing Duck, Ducktales, Talespin, Muppet Babies, Fraggle Rock, Smurfs, Snorks, Batman, Peanuts specials. The list could go on an on.
I've started to stock up on these for when I have kids. You can get them pretty reasonably priced on amazon.com . Don't want to have my kids put up with 3D Mickey and the gang or Yo Gaba Gaba. Plus, then I can enjoy watching the shows with them. Right now I have the first three seasons of Ducktales, season one of Fraggle Rock, and Darkwing Duck, as well as Chip N Dale's Rescue Rangers and Doug.
Yeah, Simpsons from season two through eight or so. Should have pulled the plug ages ago.
I love the Flintstones too, but for me it depends on the episode. So many good ones, but so many bad ones too. Hanna-Barbera got terrible by the 70's.