I have owned about everyone on the list except for the .50 and the flamethrower at one time or another, and still have about 3/4 of them now.
For me it will always be the M1 Garand. That is my favorite rifle to shoot. Behind that would be the Johnson or BAR. When I take either to the range, I always get a crowd of people come look at them. In fact I don't know if I have shot the BAR. Everyone crowds me and I can never fire it. lol