I think Alex Brown and McClellin were both around 6-3 260. Brown was your lunch pail type player - played the run tough and recorded 6 or 7 sacks each and every year.
Armstrong's problem was that he came a few years after Dent and Hampton and was never full appreciated. He had over 100 career sacks and had double digit sacks 4 times in his career - most of his sacks came while he was a Dolphin.