Doors pop in pretty easy when given a solid kick.
Consumer Reports did an evaluation on doors a couple years ago, and the only plain-jane, basic, factory entry door that resisted their 400-pound "door kick" test was the Therma-Tru Fiber-Classic
Multi-point Locking System equipped door.
Again, these were simple, basic entry doors - no special all-steel, fire-rated, bullet-proof doors, or anything actually designed for security.
So... a deadbolt with long screws isn't going to do a whole lot to protect your plain-jane door from getting kicked in.
You could try using one of these to keep the door jamb from splitting open:
http://www.invasionproof.com/?gclid=COGT47Kh2o0CFReEhgodMCwJaQ
But then, you would also need a metal plate that wraps around the door where your locksets are to help reinforce the wood lock block, otherwise this would now be the weak spot.
Also, a good deadbolt that might hold up to the kicks would probably cost over $100.00 - something like a Medeco.
You could also put in an all-steel security screen. Since these generally open outwards, they are pretty difficult to kick in. Also, anyone trying to get past this would hopefully make enough noise to warn you before he got into the house.
The sad part of all this is that no matter how strong your door is, all anyone has to do is break a window and he's in your house anyways.
3M makes Security Window Film and also a Window Film Attachment System that will actually bond the window film and glass to the frame.
http://solutions.3m.com/wps/portal/...E3E02LECFTDQGG85_nid=1B65N1DKV4beT4DCJBL6BVgl
I have had no experience with security window films, but once you start trying to secure all the weak points in your house you find out that it can get really expensive!