I'm not posting to suggest a type of safe or a retailer from whom to buy one--just general information on gun safes. If you find one you like with some fire rating (the more the better, obviously) go for it. And, if you've done some research you've probably read to buy bigger than you think you need. I agree with that statement. Any safe that advertises they are a 10, 12, 30 gun safe (whatever the number), don't believe it. It might be possible to fit 12 guns in a 12 gun safe but only if you remove all scopes, slings, bipods, etcetera before locking them in the safe. My experience is that it is impractical. You will also find that once you start storing your ammo and other valuables on the shelves (especially if fire rated) you'll wish you had more space.
I also went with an electronic lock but now wish I had gone with a manual dial. The "internet" folks are saying that an EMP would disable an electronic lock. I've written and researched the matter and it appears that extremely low voltage systems like electronic locks would not be affected. Worst case scenario in my mind, second only to being vaporized in a nuclear ground burst detonation, would be to lose access to my "stuff" in the safe. Good luck finding what you want.