I would say in safes for the most part, you get what you pay for.
I have owned 4 different sheet metal safes (own two stack ons now) and if you had a big crow bar, you could get right in them. If would take some bending, some muscle and some noise, but only take fifteen minutes to clean the safe out. Mine have a three point locking system.
Plate steel safes aren't going to let them access it with a crowbar, but they are heavy as $^#@. If you have a way to get it where you want it, and are going to keep it there, I would recommend it. I had to help move a plate steel safe from a basement, to the back room of another house a few years ago, it was a hassle. There were three of us, and it was a small safe, maybe a ten rifle safe, but still heavy as hell, and a huge pain.
I live in an area, where my safe is to keep "honest people honest." I'm really not too worried about a break in. If I lived somewhere else I would definitely upgrade. I would get a plate steel safe with a double or triple cross bolt lock. A small one like that will run you $700-1,000 Big ones up to 8 or 9 grand. My 8 gun stack on ran me $200 I think. When I lived in Arizona, I found an 8 gun at walmart, comparable to the stack on, for $70!! I couldn't pass on a deal like that. I sold it to a buddy of mine when I left for the exact same price I bought it for.
My old man has a homak I think. It is reinforced sheet metal, pretty good safe. Tougher than the stack on, but similar design.
I know people who have canons (people with much more money than I) and I tell you, they are huge. You would need a tank to bust one of those things open.