A few things, most of which have already been said. Look at your current inventory, figure out how much safe will comfortably house it, and then increase the size of the safe you buy at least by half. Plan ahead, like before you write the check, for how that safe will get to its final destination. Decide in advance how much security you are willing to pay for. Just because it's heavy and metal doesn't mean it's actually a "safe." Carefully inspect the interior shelving. Most of the inexpensive "safes" have shelving made at best of plywood and at worst of particle board. Guns and the stuff that goes with guns are heavy. Finally, I'd rather have a mechanical combination lock.