Fella's;
When it comes to RSC's, find the one that gives you what you need at the lowest cost. For anything in the $1,000.00 range there's no practical protective difference from one brand to another.
In my opinion, at the high end of RSC's, the AMSEC BF series is probably the best bang-for-the-buck. But, I've had no hands-on experience with a Sturdy or Summit Denali.
The sad fact is, that when you start putting serious amounts of steel in a protective container, you get the attendant costs of that plate steel. Which not only includes the price of the material, but the increased labor to cut it, move it, weld it, and form it into a good safe. For instance, you can't get a credit card into the door/frame seam of a Graffunder. I have met RSC's that I can stick the end of one of my fingers into that same seam. You don't have to guess which one's more susceptable to a pry bar attack. And, if they just bend the sheet metal sides of that RSC, and bend again, and again, to form the bolt frame - - well you've just locked up behind bent sheet metal. The Graffunder frame is .750" plate steel. So try to drag a 1.25" solid bolt through that frame to pop the door when you can't get the tip of an effective prybar into the seam. I'll sell tickets to watch you engage in futile behaviour.
Yeah, safes cost more. But, you get what you pay for.
900F