My favorite would be the Webley Mk. IV, with a 6" Mk. VI barrel, modified to run .45 ACP in moonclips. It has Style, Panache, Character and History. It is also one of the best shooters I've got. I'm better with this gun than with most of my other revolvers, regardless of caliber.
A close second is a .44 mag Mountain Gun. Accurate, superb balance, big boomer.