I am a pretty avid follower of boxing; Ali is definitely my favorite of all-time.
As far as currents... well, my favorite heavyweight is.... Kevin McBride. Am I on the bandwagon? Nah, I've always liked him... Irish Pride, baby.
Needless to say, the heavyweights have been a disappointment for the better part of 15-20 years.
Otherwise there is some good boxing going on now in some of the lighter-than-heavyweight divisions. I do like Bernard Hopkins, because he's crazy. I remember he threatened to kill Roy Jones Jr.'s chickens if he didn't accept his challenge. I also like Winky Wright.