E24 BMW 6 Series Coupe immediately comes to mind as a must have 80s In My OpinionI love the '80s and there are indeed interesting cars from that time (on the other hand there are many dull (and square) cars from the '80s as well). GT could definitely use some more.
I checked this yesterday actually and there are only 5 premium cars from the '80s, plus they're from end-'80s which I think is the least interesting part of the '80s.