[aigel]

I am not an expert on this subject but I'll start off with some basics until the pros chime in: I would not buy an electronic lock. I like the mechanical versions. They are safe in terms of break-in but will be slower to operate if you are in a hurry.

Always buy bigger than you think you'll need. This will have the side-effect of it being heavier and not as easily carried off. On the note of carry off: Make sure to anchor whatever you get solidly to the wooden or concrete structure of your house.

G