****They may be a bit heavier than the specs you listed, but Graffunder makes some well regarded safes that might meet your needs. A cheaper safe becomes much more expensive if a thief breaks into it and takes all of your guns..
Mike Thompson just delivered a large Superior Safe (Master series) to my place. My third purchase from him. Mike is a class act. Cannot recommend him highly enough.
As mentioned already, the Superior plate doors are several steps above the cheesy composite doors (like Champion uses now).