Check out AmSec, like someone else posted. Skip the big box stores. Skip the electronic keypad.
BOLT IT DOWN. I cannot state that enough. If it can be moved, it will be.
Contrary to what a lot of people think, hinges on the outside aren't usually a bad thing. If there are bolts locking the door all the way around the inside, it doesn't matter if the hinges get cut off, the door still isn't coming off. Plus, exterior hinges allow the door to be swung open more giving you easier access.
Make sure there are bolts all the way around the inside. If one side can be pryed
on to pop the door out, it doesn't matter how big or heavy the safe is.
A couple of examples I've personally dealt with -
This is a huge Canon safe. No exterior hinges, and hardly any bolts around the door. As you can see, one side was pryed on and cut on and the door was completely removed. Minimal work for such a heavy and expensive safe.
This one is a Winchester. Heavier gauge steel. Better door. If it had been bolted down, I suspect the owner would still have it's contents. But, it was removed from the house, where it could be worked on at their leisure.
It's also one of the many reasons I say skip the electronic keypad. Had there been anything left in it, the door might have been able to be opened for easier access with a dial. Now that the keypad is broken off, it's not so easy.. Not to mention batteries dying, malfunctions, etc...
BTW, both of these safes were removed from the house they were in before they were broken into.