Even a TL30 will only buy you time.
The safe, is your last line of defense from a burglar. I'd spend a little less on the safe itself, and the balance in things like a security system.
You will likely never recoup the price of truly great safe. And there are plenty of ways to make a good safe into a really good one. (Bolting it down, encasing the sides to prevent access) ect.
Not to mention, even if a good safe keeps them out, be prepared to buy a new one or spend some money to repair the damage they did to it.
"If there must be trouble, let it be in my day, that my children may have peace"