Ok so here is the skinny
Your typical "urban" front door is a wood frame POS that can be breached in .1 seconds with a decent piece of pipe.
There are ways to reinforce that POS door but only to the point it takes 2-3 strikes to open rather than 1.
Here is my solution
http://www.homedepot.com/p/L-I-F-Ind...280R/202516077
A steel door with a steel frame, many times better than the cheap wood version.
A lot of security for those that are bugging in, I just installed 1 of these as my main door.