Mattingly had iconic cards, and growing up watching him play, he is also my favorite player. He would have been a hall of fame lock if not for his back injuries. His '84 Donruss and Topps rookie cards are iconic for the 80's, right up there with Rickey Henderson, Ripken Jr., and Griffey Jr. I would include the '85 McGwire to round out the top 5 of the 80's, but given the steroid scandal, here's my top 5.....
1 - 1980 Topps Rickey Henderson
2 - 1984 Donruss Don Mattingly
3 - 1989 Upperdeck Ken Griffey Jr.
4 - 1982 Topps Traded Cal Ripken Jr.
5 - 1984 Fleer Update Kirby Puckett