There have been a few previous threads about safes on here if you do a search. Here are a few things I learned while researching the topic a few years ago-
Most of the safes you see in the stores are expensive lock boxes only capable of stopping smash and grabbers. You have to spend well over $1k to get a safe that will slow down a determined thief and many of those 1k plus safes are just fancier looking lock boxes.
You need to spend upwards of $5k to get a safe that could deter a thief with the proper power tools and even that would only slow them down for awhile.
The fire protection in most safes will not keep your firearms and personal papers from being damaged in many fires that burn long and/or hot enough.
Storage capacities are highly overrated. If a safe says it holds 10 rifles it will likely fit 5 or less along with your other personal items. Most people regret not getting a bigger safe because we all end up getting more firearms down the road:)
The minimum recommendations for a safe that would really slow down your typical determined thief are 10 gauge or thicker walls and a 1/4” or thicker door. Don’t confuse the thickness of the door with the thickness of the steel used in the door. Some manufactures brag about their 5 inch thick doors but they only have a layer of 14 gauge steel. A safe with these minimums can cost over 2k. I’d go for at least 12 gauge steel all around if you are on a tight budget.
Champion safes like the one @OldGnome has are well regarded. They also have a slightly fancier Superior line and a budget Safe Guard line. All made in the US.
Sturdy Safes are US made and have a good reputation.
Steelwater heavy duty safes are not US made but seem like the best bang for the buck out there. They have electronic locks but come with a high quality key backup in case the electronics fail from age, EMP, or the sun burping in our direction.