I recommend the "Fort Knox" brand..
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I have this brand in the Defender series. I looked long and hard for safes and settled on this brand. It has one of the best fire ratings (90 minutes at 1400-1600 degrees), has a lifetime warranty, and wasn't crazy expensive. I looked at ones from Costco, Sportsmans Warehouse, the Liberty, Brand, etc and they don't match the specs. If you're putting it in your basement, you probably don't need to bolt it down. Mine is in my basement and with everything in it, it probably weighs over 1000 lbs, so I didn't have the installers bother bolting it. If its in your garage, that's a different story.
It's completely configurable to what I want with the racks and shelves. My dealer was top notch, put titanium plates down to protect my floors, and made sure my staircase could handle a half ton of men and equipment going down it.
Regards,
Randy