It's hard to go wrong with a "Simplex" handgun safe. Most are made with thicker steel than their electronic counterparts. Also, in the unlikely event that you if ever wear out the lock you can just replace it. All electronic ones are throw-aways with no parts available. The things that I would consider is where and how will you mount it. Most can only be used in one orientation, like a cigar box.
Probably the most affordable is V-Line, but also the thinnest steel on their basic unit. They have some other models and mounting brackets that might fit your needs.
Fort Knox and Amsec make good ones that are 7GA door and 10GA boxes. Again, how you use it/mount if might make a difference.
FAS1 Safe makes the heaviest (7GA all sides and door) and the holstered gun is presented to you via gas strut. This design lets it be mounted just about any way. All these brands are a little different and some have unique options that will also drive up the price, but also might enhance security if you leave a weapon in it all the time.