Sadly I never had the classic SNAKE vs. MONGOOSE set, although I did want it.
I still have my Hot Wheels in that collector's case that looks like a mag wheel/tire with the metal collector's buttons in the middle. I also have some cool GI Joe stuff - the Gemini space capsule with landing raft, and a German soldier GI Joe with the Iron Cross medal. I even have the skiing GI Joe (the big GI Joes, not the little plastic ones that came out later).
Don't forget "the Kung Fu grip!"