Most impressive amateur not to go pro was definitely Matt Mendenhall. I worked at a gym he trained at in the late 80s, early nineties. TINY joints, small waist, hips, flaring quads, huge arms, fantastic delts, incredible width. I heard he had a serious coke/McLish problem though that prevented him from attaining his best condition, but definitely one of my favorite physiques. He dwarfed Strydom when Gary won the nationals. Too bad he wasn't as dry as Gary.