I don't own what I would call "hi end" guns but I have a number of them, and had a sherrif friend of mine just say that anything you can lock will do just about as well as another, with the exception of moving to a fire-rated safe. Mine isn't fire-rated, though if I had Boone's pocketbook, I'd probably own one that was.
You can even get a servicable safe for under or about $400 bucks that will be all you need. I got mine because the grandkids were hanging out a lot and I just wanted the peace of mind to know they weren't accessing them without supervision. There are some economical key-lock gun cabinets that hold guns (i.e. Gander Mountain is where I saw some of various sizes) that would also serve the purpose.... screw one of those down to studs or floor bolts and you are good to go too.). Just another option for you other folks on a budget.