I have been thinking about getting a set of western style guns. A classic three gun system. A handgun, rifle and a shotgun. I'd keep them simple with just the plain iron sights, wood stocks and grips.
I would get modern calibers for the however. This Ruger SBH comes in .44 mag as does the classic Marlin lever action. I like the commonality of ammo. I also like the .44 mag round from a western style grip. The way it rocks up with the recoil is nice. Plus, a .44 mag is sweet for hunting deer from a rifle.
A classic double barrel 12 gauge shotgun is always good to have. Even if it's just so you can say, "Alright you Primitive Screwheads, listen up! You see this? This... is my boomstick!"