Beautiful guns, Geronimo. Gotta love the Holland and Holland. The most valuable rifle I have ever had the opportunity to fire was a Holland and Holland Royal Grade double in .577 Nitro Express. It was worth more than the car I drove there in (and that was my longhood), and for the cost of one cartridge I could have filled the gas tank on that car. The guy had just taken delivery, and was terrified to fire it, so I volunteered.
While I can appreciate a fine shotgun, I don't own any of my own. I don't consider myself a "shotgunner". I much prefer single shot rifles and single action revolvers. My shotguns are working tools, used for hunting and occasional clay birds.
My "main" shotgun is a muzzle loading 10 gauge double. I've hunted everything that flies with it for over 40 years. It's an amazingly versatile game gun, from goose to quail.
My "other" shotgun is an inexpensive 12 gauge double from CZ USA. Turkish made, it's of surprisingly high quality. Fits me like a glove, too. Something I can muck about with on our rainy Pacific Northwest fall days and not feel too bad about.