Sold my 4" .500 just a few days ago. Was a blast (literally) to shoot, and pretty darn accurate and very well-built, but dang the ammo is expensive!
OP -- what's the middle one in the right column? i.e. stainless finish pointing left. That's a great collection! Until I sold my .500 a couple days ago, I only owned two revolvers. One was the most powerful production revolver in the world, and the other one is the smallest revolver in the world. Pretty silly, really: