You're going to get more pistols, and perhaps a few long guns. You also have important documents, passports, jewelry, data drives, other valuables that need secured. Think about your needs beyond a few pistols.
I got a 2.14 cubic foot safe from Costco. It's made of "durable resin" (plastic!) and has wheels and a handle so the thieves won't strain themselves. Actually it's pretty nice for $270 but more of an office safe than a gun safe. It is waterproof so I keep mostly papers in there. It would hold maybe a dozen handguns and can be bolted down for better security.
