Random top 15: Tea Leoni.
Why she's in the top 15. That adorable overbite that makes her look simultaneously approachable and naughty. Put that on that slinky body and you have a recipe for success.
Honorable mention: Marcia Strassman (Mrs. Kotter.). She was low-key gorgeous, and women with glasses are particularly sexy. Plus, if she married a loser like Mr. Kotter, she was attainable for a teenage kid like I was back then. (You could also substitute Pam Dawber of Mork and Mindy into this slot, but I'd go with Marcia.)
