Thanks for the thoughts guys! It sounds like Fort Knox would be nice but maybe a little beyond what I'm looking for...
The Sentry looks nice, would it be as able to hold up to a smash-and-grab attempt as, say, an AmSec, a Liberty, or a nicer Browning or Winchester model?
As for the Zanotti, that sounds a little odd - I'll definitely look into it. The first though that springs to mind, though, is that it would be easier for a thief to cut through.