For the most 80s opening theme possible, it can only be Street Hawk:
Street Hawk (1985), which is sort of like Knight Rider for motorcycle buffs, had the good taste to rework Tangerine Dream's "Le Parc" for their opening theme. It's amazing, especially combined with the introduction sequence to each episode. THE MAN. THE MACHINE. STREET HAWK. FUCk YEAH.
I'm sitting here trying to think of an anime opening theme that's better than "Dream Island Obsessional Park" and I don't know if I really can top that. Well, okay, "Angel Night" from City Hunter might tie it, but it's pretty close.