Count how many long guns and pistols you have. Then double that number and go buy a safe that holds more than that number. Safes are like pole barns in the fact that most people run out of room in the first couple years of getting it. Also, look at things like mentioned above, ability to anchor to floor, fire ratings, quality of materials used, steel gauge, ability to configure and reconfigure interior, interior lighting if any. Champion and Liberty both come to mind to look at. Also, the below are good considerations brought up.