Rifle:
Any well cared for pre 64' Mod70 in a bolt action for "classic" good looks.........the newer Kimbers are very nice too.
For some reason I can never keep my eyes or hands off a Ruger #1 with a good looking hunk of wood as well.

Shotgun:
Hands down a Winchester Mod 21 SxS.........someday I'll find one some old lady is selling in a yard sale.

Muzzleloader:
a Cabin Creek "Yorktown" flintlock rifle.

Handgun:
My favorites are the Colt Anaconda, and Kimber Pro CDP