Here's my list, from largest to smallest. I did it in Excel so the results cannot be questioned--they've been scientifically validated by me.
1 Ronnie Coleman
2 Phil Heath
3 Sergio Oliva
4 Arnold Schwarzenegger
5 Jay Cutler
6 Dexter Jackson
7 Dorian Yates
8 Lee Haney
9 Samir Bannout
10 Larry Scott
11 Franco Columbu
12 Frank Zane
13 Chris Dickerson