No question that Graeffunder makes one of the very best safes available. I've been looking at their products for over 20 years. I can't justify the cost, however.
Liberty makes a decent safe, and almost all the big names like Fort Knox, National Security and even Cannon make good products at various price points. Every, I repeat EVERY, safe can be compromised with enough time and equipment. Every safe will have the internal contents damaged if left in a hot enough fire long enough.
Your needs will vary based on location. In rural WYoming or even Utah, the fire department could be an hour or more away, and may not even get notified until the cabin is burned to the ground or the surrounding forest fire begins. In most towns, even with volunteer fire departments, a 30 minute response is almost unheard of. Quality fire protection is important, but most ratings beyond 60 minutes should rarely be needed.
Steel thickness is another trade-off of cost versus time. Avoid the sheet metal cabinets, of course, but once steel on all sides exceeds 1/8", you are starting to gain little benefit for a lot of cost. 1/4 plate is wonderful, and even my preference, but the same tools needed to get through 1/8" steel will get you through 1/4" steel with just more time. You don't want steel soo thin that a battle axe can break through, but once you need a cutting torch, well, a torch will get through most any thickness with enough time.
I own one Liberty safe, among others. It will stop all but the most skilled and determined thief, and provide reasonable protection from a short lived fire. Bolted to the floor and properly locked, even the lighter weight Canon will do the job most of the time. I personally prefer safes that weigh at least 600 pounds empty, and those that weigh over a 1000 pounds make it exceedingly unlikely they will be removed from the premises. Again, bolting to the (concrete) floor is the best deterrent in this area, but few people actually do this.
I am a strong proponent of using quality gun safes, but don't let your search for the perfect (and very Expensive) gun safe keep you from purchasing one that is perfectly adequate for your intended use. The Liberty and even less expensive Canon safes will provide reasonable protection for most people.