Here's my evolution and conclusion;
1.) I went on line to various gun related sites and looked at dozens of posts.
2.) Watched the Youtube video where a couple of average guys brute force a typical gun safe open in about 10 minutes.
3.) Determined that Sturdy and Fort Knox were both good choices and "built" them online-by the time they are armored and have stainless steel added for torch protection you're in the $6000-$10000 range
4.) Did more research and then went to look at real safes-UL rated-safes on craigslist, most gun safes are considered RSCs or Residential Storage Containers. UL rated safes are designated TR for torch protection, TL for tool protection
and TX for explosives. They also have a number rating of 15, 30 or 60 and some have a "x 6" which means all 6 sides are the same level of protection. A TRTL 15 x 6 will withstand at least 15 minutes of a steady and vigorous torch and tool
attack by someone.

I saw a TL15 for $2000 OBO and have seen TRTL 30 x 6 going for around $4000-these weigh in at about 5000lbs.
Buy a used high security safe and rework the inside, you'll get twice the safe for half the money.