My aunt (a teacher) used to buy me Capsela sets. They were ok to play with, but I much preferred Legos. I had lots of town sets (firehouse, airport, etc), as well as the classic space sets, including the one below, which is on someone's list of the 6 ugliest space sets:
Some of my favorite sets were the humorously named Lego Blacktron space sets. The ships were built to intentionally split apart into several interconnected pieces (like a shuttle pod coming off the larger cruiser), plus the black Legos just looked awesome.
Transformers was the only cartoon I followed that had merchandising, so by default most of my action figures were Transformers. I had a few Go-Bots (such cheesy knockoffs), but I didn't know their mythology, so I usually just incorporated those figures into my Transformers play. I got into the series/toys right after the first set of G1 series started disappearing from stores (Optimus Prime, the first Bumblebee, the original Megatron, etc.), so anytime we'd go on vacation to a place with old stores (out of the way K-Marts, outlet malls, etc.), I'd scour their toy departments for old figures. I still remember one trip we took to South Carolina, and I hit the motherlode for all kinds of old figures I'd never seen, but my parents would only let me buy one. I got Blaster (the Autobot cassette player), and ended up passing on the Dinobots.
Back home, there's a large toy chest filled with all my Transformers and their weapons. Even as a kid, I was careful with my toys, so they're all in decent condition. One day before my dad sells the house (early next year, probably) I need to go through all of them. I don't really want to sell them, and maybe if I've moved to a bigger place by then, I can set up a way to display some of them.
Jam it back in, in the dark.