To each their own. I started shooting BP over twenty years ago with a Pietta brass-framed .44 cal '51, and still shoot it today. I wouldn't hesitate to recommend a brass-framed Colt as a starter pistol; they're cheaper, look great, and, since you use a lighter charge, are great for getting used to BP shooting. As for those who keep suggesting Remingtons, I now have seven Colt-style Pistols, and wouldn't trade a single one of them for a Remington (I had a Remmie once but never shot it , so I gave it away). If you want a Colt, get a Colt.
That being said, I'd get a '51 Navy, .36 or .44, brass or steel, and you won't be sorry. They became famous for being natural "pointers", and do fit well in your hand; they become an extension of your arm very naturally. And they just look so cool! I mean, could Wild Bill have been wrong? I think not