As much stick as Khan gets here, nobody can deny that he wasn't shy about going toe to toe; which as you say, given his shaky whiskers and lack of big punching power to bail himself out of trouble, wasn't really the smartest choice. Mickey Walker would be my shout.
The actual answer here is Jesse Feliciano. Guy would have walked head first into a wood chipper if someone asked him to.
Fernando vargas- that was the most violent of fisticuffs I've witnessed between him and Tito. Also Castillo vs corrales- Castillo's bleeping eyes were rolling in the back of his head as the ref stopped the fight. Equally vice versa- corrales- kept getting off the deck to win the fight. Btw, c vs c were the loudest punches I've ever heard in a prize fight on tv.