Champion, Heritage, and Superior are also all good brands of safes.
Depending on where you live, I would look for a business that exclusively sells gun safes. They are the most knowledgeable and will have the best selection. Things to consider like you were mentioning is fire rating, solid steel vs composite (and thickness on various sides), pin size & location, locking mechanism, etc, etc, etc....
The big box stores typically all sell over-priced cheap Chinese junk. Likewise finding a person there that knows what they are talking about is also very rare.
You can get a decent safe for $1,000 depending on where you live. But honestly look at them as a long-term investment and also look at the value of what you are storing vs what you want to spend. I can't believe some of the people that would only spend $500 to protect $50,000+ in valuables....
Also, if you find a gun safe store, usually you can trade in your old safe for credit when the day comes that you want to upsize.