need a good gun safe, any suggestions

[Squid4]

I need to get a gun safe. I need to put it in my basement. My house is old so my basement is not finished, it has concrete walls and floor thats it. So i need a safe that can withstand the temperature change of the seasons and one that will protect the guns inside so the change of seasons won't affect the guns...any suggestions?

thank you ahead of time for you thoughts.