For me, a security door is a big hunk of steel, in a steel frame. Anything other than that, I can kick down unless some or other miracle-device is employed.
Commercial-grade prehung doors are not difficult to order from many lumber / building materials suppliers. They usually come with the oversize Schlage deadbolt etc, which are very high-tech in terms of being drill proof etc (with little ball bearing in front of screws, and that kind of thing... they're really pretty neat.)
The biggest issue is to set the frame really solidly. If the supplied cleats can't be fitted, then we're talking lag bolts or something. It can be kind of a drag.