Kyle Williams, Eric Moulds, & Ruben Brown with Moulds being the most worthy. He came out of that great draft class for receivers in 1996 and he was as good as any of them with the exception of Terrel Owens. That includes Marvin Harrison who had the good fortune of being paired with Peyton Manning for years. Moulds, on the other hand, was great with multiple QB's (Flutie, Johnson, Bledsoe) and a variety of offensive systems. Plus, he passes the eye test. He was a ton of fun to watch. Also. don't forget, he held the NFL record for receiving yards in a playoff game with 240.
Plus:
http://www.pro-football-reference.com/teams/buf/single-season-receiving.htm