Although it is a bit small for my hands, I would vote for the Colt 1862 Police with the 4 1/2" barrel. Ideally it would be fitted with ivory grips.
Of course, I think all the Colt revolvers are the best looking pistols made. But, they are not without their problems, like Col. Colt's famous disappearing rear sight (the tip of the hammer) and the fact that every time you remove and replace the barrel, it can lock up the cylinder if you tap the wedge in too tight. I think all of them from the 1860 on are more sleek and graceful appearing with the creeping loading lever.
JMHO,
John (Bigsmoke)