As a child of the 80's, I had GI Joes, He-Man, Legos, etc... But, my favorite was always Transformers. They were expensive though and I built the bulk of my collection through flea markets in the early 90's when they were worth practically nothing.
Though, I sold off my huge collection years ago. I kept a few including my first Transformer my Dad bought for me, Huffer, a mini that sold on a card for a couple bucks or so. He's a really early U.S. Version without the rub off sticker that came soon after their launch in the states.
Though he's nothing special in terms of value, he'll always be my favorite.