Liberty, stack-On, Cannon, ….. all very good safes. Key is to go on their website and read the specific details for what attributes your looking for. In the case of fire proof/heat resistance for documents, there are a ton of manufactures out there.
Here is a list of 54 of them with a quick description of the company. I pro-staffed for and rep’d Liberty and stack on. They each make safes that are branded under other dealer names as well.
http://www.safeandvault.com/faq/114-safes/706-list-of-safe-manufacturers