Tough choice really, i mean alot of the fighters that are huge i wouldn't pick for that reason, i think they are over marketed.
Thats why i'm a big Evan Tanner, Sean Sherk fan because they are pretty low key guys but are great big hearted fighters in the ring.
But if i had to choose one id say Mirko Cro Cop. I'm a big Cro Cop fan and i think the amount of KO's/Aggresiveness/and his strikes really brings around alot of new and old fans. I think everyone likes to see Mirko's left leg go up.
What is it that is going to be on your mind when you're on your death bed? Will it be the tedious years of 9 to 5, or the memory of some great acheivement. Maybe a moment you stood in glory to the applause of millions.