I have read about great safes
The most interesting, and perhaps safests, safes are those that you don't see at all. They are the ones that are built into the structure of the building, be it a home, office or other commercial building. I am not refering to size or capacity, just the hidden aspect of them. Anyone can find a safe that is out in the open. It takes someone really searching for one that cannot be seen unless you start breaking into walls to find it.
The one safe I was drooling over was the one I saw at a gunshop which happened to be in a former bank. All of the guns were housed inside the former bank safe. Suffice it to say, when those guns were locked up, they were locked up. You would have to be a really dedicated person to break into it as the door looked to be about a foot thick at the least. I judged the capacity of it, if you put in floor to ceiling racks, removed the display counters and put in the equivalent of firearm bookshelves, to be around 500 rifles/shotguns at the least. Too bad you have to build a building around that kind of safe....
I think I would go with a safe that is able to be hidden inside the walls of a home, even if it came at a loss of capacity.