I don't really have much of a recommendation on which of the three safes to choose from, but I have a couple tidbits of info that may be something to consider before you pull the trigger, so to speak. After all the reading I did around gun safes a few months ago, I noticed a few interesting things that really highlighted some key points for me, when it came to choosing a gun safe.
First, the fireproofing most gun safe manufacturers use won't do much in the event of a real house fire. They may be "rated" for certain temps, but those temps are only simulated in an over. In reality, house fires get much hotter and burn much longer than those "rated" safes can deal with. And there's also the warm-up and cool-down times for a fire, too. The high-quality safe companies don't actually use fireboard for fire protection. They use a solid shell poured around the inner steel liner to get a good, solid, one-piece shell for fire protection. If your house fire is a real doozie (as in, your house burned to the ground), your average fireboard safe won't protect your guns for very long. If you have a fire department nearby, that may allow for consideration of lesser fire protection and ease some of those concerns. It also depends on how much you're willing to pay for this extra "insurance" against fires. Do you have an older home? Are your guns quite valuable? Do you feel that you really
need fire protection where you're keeping your safe? Or are you getting it just because you'll feel warm and fuzzy about having it "just in case"? These types of questions can go a long way to helping you find a compromise as to what you want versus what you need.
On to my second thought: I don't have much trust in something as thin as 1/8" steel plate. While it's true that it's better than nothing (especially those cheapie gun cabinets you could probably pull apart bare-handed), and it will definitely keep kids and perhaps the dumb burglars out, a true gun
safe that is built to protect against burglary isn't just heavy. It also has a thick door and walls made with hardened plate to prevent drilling, grinding, torches, hacking apart, etc. Thin-walled, less-expensive safes can have a fire axe driven through them. Then it's just a matter of some cutters or a saw to open it up. Some of the high-end safe models have 1/4" to 1/2" plate, or thicker! It's not just about how many door bolts you have. If it's easier to just hack the safe open with an axe or torch, why would they waste time sawing through steel bolts?
I've considered getting a gun safe. But, if I'm spending a nice wad of cash on a gun safe, I need to set my expectations: I'd better have nice guns to put in it. And I'm also planning to get something built a but better than most of the common "gun safes" are built, even if I have to spend considerably more to get it. But until then, a simple, non-fireproofed safe would do just fine. Something to keep kids and hooligans out. I don't have any really nice guns, yet. But, I also realize that I can't expect high-end security just because I paid a bunch of money for it. It may seem like a lot, but $1,500 isn't all that much in the world of security. You get what you pay for.
Now, any safe is better than nothing. If your budget only allows for $1,500, then get what you can afford. And the concrete fiber board will provide some limited protection in the event of less-intense fires.
A few tips, as well:
Don't forget to bolt that safe down, and try to put it in an area that's not very easy to remove for a burglar. Most of them will just wheel the safe out and deal with opening it later. If you can prevent someone from even getting it out, that would go a very long way to protecting your firearms. (That's where that 1/2" steel plate really makes it heavy and hard to wheel out without 3-4 guys, or a forklift! And some people even build structure around the safe, or wall it in and hide it behind a false panel.) And for heaven's sake, don't go advertising that you have guns to all your neighbors by putting the safe in the garage. If no one knows you have guns (aside from people you trust), you'll have a much lesser risk of burglary, in general.
As for finding a high-quality safe, the best safes I've found, so far, have been the Brown safes, both in regard to fire and burglary protection. Unfortunately, they're also a bit spendy. But, again, if you have a lot of guns, or if you have expensive guns, it may be worth shelling out for something that will provide superior protection. I have no idea what the OP has to put in this safe. So, a Brown fire safe may be some serious overkill for their needs. But, you can find a burglary-rated non-fire safe for under $2k. And one around the size the OP is looking for would be around $2,200 or so. It has 1/2" steel plate for the door, and 1/4" plate on the walls. (Fire protection on the same size puts it around $3,500....ouch!) If you can live without fire protection, that's a great safe to protect your gun collection. Here's their line of "value-priced" weapon safes, if you're interested:
http://www.brownsafe.com/features_weapon_safes/Weapon_safe_single_door.html It'll probably be what I'll go for, when I start expanding the collection with guns that are worth a bit more than I can afford right now.
I don't mean to sound smug about any of this stuff, so I apologize if I do. I'm a mechanical engineer, so I tend to really go nutso on the details, and always try to reach perfection. I really just want to share what I've learned during my searching, as well. This stuff really opened my eyes to what kind of quality we really get when looking for gun safes.