Here's something I can recommend... See if there is a Cowboy Action event you can attend... not that you should get a single action for your first revolver, but it would give you a real appreciation for the history of the weapon, get to see some good firearm handling technics ...and (as stated by an earlier poster on this thread) it's just plain FUN !!
If you are looking at a revolver, I would recommend either 357 (the most versatile revolver chambering) or 22 (since you don't list a 22 in your collection). Everyone else has pretty well covered S&W and Ruger, which are the revolvers I own.
I do have a .22LR conversion slide for my Kimber 1911. .357 / .38 might be the way to go with ammo the way it is now -- there is not .22LR to be found anywhere it seems, well not for a price that makes any sense at least.