We've been discussing safes here for a long time. We probably need a separate section just to cover it. The same thing takes place over on the sigforum, where they have a safe seller for St. Louis who posts regularly. I don't agree with everything he says, but then people who sell safes sometimes make self serving comments.
First and foremost, safes and gunsafes are two different animals. Gunsafes are combination locks on sheet steel cabinets. They're designed to keep idiots and fools honest. Anyone with any metal working ability or common hand tools can enter one. Sometimes with less effort than you realize.
The worst are the key locking cabinets. They still have a place, and once you out grow them they make excellent ammo storage lockers, or decoy's. The best safes are beyond most of our finances and probably beyond the structural ability of our homes. It leaves us in the middle. You can buy a good quality safe for $600 at Sam's club or WalMart. Its not huge, its not foolproof, or fireproof. But it will deter most smash and grab crooks. To many of them, it looks like Ft. Knox (not the brand, the base.)
If you want fireproofing, you need to understand the concepts. The material installed by safe makers is usually drywall. The same general stuff you have on the living room walls and ceiling. Its Gypsum board, which has the ability to hold water under normal circumstances. When it gets hot, it releases that water onto your prized guns (at super heated temps.) A much cheaper and easier solution is to just install a residential sprinkler head over the safe. Cold water on the outside of a steel box beats hot water on your guns. Some truths: Plastic pipe isn't good. Copper pipe soldered together will continue to hold up until the water stops flowing inside it. Threaded pipe may last even longer.
Safes are heavy and they attract attention. Do it yourself methods are OK if you have confidence, and trustworthy friends and offspring you can impose on. At about the 600# range, that option may not be so good. If you move the safe home yourself, do it after nightfall or with a tarp over it. If you bring the box, plan on not leaving it outside where anyone can see it. Burn it or take it to someone's home you hate and leave it out for their trash! It flags the house as having something worth breaking in to steal.
Buying from a reputable dealer may or may not be smart. Here's the test. Drive to the dealers or past it after business hours. If his large delivery truck has things like "Bud's Safes" or "Bud's Gunshop" plastered all over the side in large letters, it might be the wrong vendor.
Yes, I did everything right. I even arranged to have the safe I bought delivered on a Sunday after dark. Then Bud's guy didn't perform. (the same Bud's everyone raves about having 360s so cheap). So they arrived at rush hour a week later after I burned up the phone lines wanting my money back. He blocked traffic for about an hour with his oversized trailer, so everyone could see Dick was getting a new toy to store his guns in. NO, I wasn't comfortable with the idea, but he had my money and after a week or so, I was just kind of happy to get what I'd paid for.
Another hint, don't pay in cash so if the dealer turns out to be a jerk and do things you don't like, you can cancel the deal. Does Dick hold a grudge? Probably forever.