At heavyweight, McCall and Toney have the best chins. If Vitali Klitschko comes back, he's got to be up there too. Not Valuev, I have seen this guy get hurt a couple of times, last time against Bergeron - knees shakin like jelly... a good big puncher like Wlad Klitschko would knock him out.
While that may be true, it's not like Toney or Vitali never got rocked before, Toney was floored by a Peter jab, as well as very rocked and had to hold onto the ropes to stay up, after Peter landed a big right hand. Vitali is no different, he was rocked a couple times against Lewis, as well as agianst Sanders where it could of been called a knockdown. There is no fighter out there that has never been rocked, aside from maybe McCall, though one could say he was a little hurt against Lewis during there second fight.