I have some experience with the Biometrics models. They are pricey, or at least they were, but they do function very well. The programming is supposed to be a piece of cake, but I played with them at SHOT, and watched the demo, and even the rep had a bit of a problem taking people from the crowd and getting their fingerprints to over write the ones from the previous showing though.
That said, they are a sound product and in the demo, they did hit one with a sledgehammer and it didn't open. Granted, they didn't beat the hell out of it or anything, but they did give it a pretty good overhead whack that was resounding.
The kind of safes that righteous is talking about are from GunVault
, and they cost about $50-$60. I have one myself that is secured to the under cabinet of the nightstand next to the bed. It's a cinch to get open in the dark, and they make a model that even has an internal light if you so chose.
That said, you can pry that thing open in about 15 seconds with a simple screwdriver, so you aren't getting a really secure model. It will keep the kids out, but it won't keep a determined thief from taking what's inside.