As far as actual toy collecting goes...
As far as actual toy collecting goes, the only toys I ever actually collected were the Transformers. I have almost all (and all the important ones that were common on the TV show & movie) of the 1984, 1985, and 1986 toy lines. Those are the only three toy lines I ever wanted, and indeed, the only toys I ever really wanted, period.
I sold all my non-Transformers toys long ago, with one minor exception. I have six G.I. Joe figures that I kept -- Cobra Commander (w/ silver mask, like he usually wore on the TV show & movie), Destro (w/ silver mask, not the later gold mask), Serpentor (w/ Air Chariot), Golobulus, Nemesis Enforcer, and Royal Guard. I just thought that the leaders of Cobra & Cobra La were really cool, that's all.
Other than my Transformers and my six little G.I. Joe figures, I don't really own anything "material", besides movies & video games on cartriges, VHS, and DVD.
Favorites! (1) Action: Transformers & G.I. Joe; Visionairies; The DCAU; Robotech, DBZ, Cowboy Bebop, Samurai Champloo & Trigun; TMNT, MOTU; and Avengers: EMH; (2) Comedy: The Simpsons & Futurama, Space Ghost: Coast to Coast & The Brak Show, Sealab 2021, Harvey Birdman: Attorney at Law, ATHF, The Boondocks, The Venture Bros., and Archer