Gun safes in garages are ripe for the thief to put a cable/chain around and pull out with a truck while you're gone. Garage concrete is only 3-4" thick so anchors won't hold. Put it in the house, pour a slab of concrete in the crawl space and then anchor it to that through the floor.
Liberty safes are usually a good buy. Don't pay sales tax on a gun safe.
-Steve