Inhumanoids and Blackstar were my thing back in the day. My Uncle loved recorded various sci-fi and fantasy shoes/movies and T.V., he was just into that stuff, and he'd send me (and my cousins) copies of the recordings. I watched the run of Inhumanoids and Blackstar over and over obsessively when I was little. They may not have made it, but, I really can't think of a reason not to still like them. Sure, I go back now and they aren't as good as I remember in a lot of ways . . . but in other ways they still have a lot of the charm that drew me in.
Thundercats and Dinoriders were also great. I did end up with Zoids, but we'd moved over to Japan and the Zoids I got there were all manner of different. I remember getting a pack of gum in Japan and in the box were tiny plastic parts to make this little flying type zoid (really really cheap plastic) and other neat stuff. I seriously have no complaints about the quality of my childhood.
Outside of Zoids, though, I never was a big action figure kid. I liked animation and things I could watch. The stuff I actually wanted to buy, as a kid, more typically was video game stuff. When I actually did get action figures seriously in any amount it was with money I'd saved up after talking to my uncle. There were these, "Alien" and "Predator" toys that were coming out which I left in their boxes. I still have them sealed and ready to be shown off one day, all on advice of an uncle that talked to me about investments. They haven't earned me any money, I don't even know how much they're worth, but they're packaged memories and I wouldn't change a thing.