Sorry to hear about your evildoer infestation. Metal doors will be an improvement over the door w/window. Others have already commented on how to strengthen your door.
What about windows? If you have any, you've still got a security problem. Fact is, anyone that really wants to get into your house, can, with just a few house tools. Thieves want to work quickly and leave the scene of the crime. The only safe way of preventing them is to actually be there. With a sledge hammer and sawzall, I can have a door 'out' in just a minute or so. Brick, rock, hammer, and the windows are gone. Portable 18v tools will handle most any challenge a homeowner can think of... and bad guys know this too. Portable cutting torches are available too.
Sure we've all heard locks are for honest people. It IS true.
If you want to catch these folks, leave out some bait, visible from the road, and have a hidden game camera observing them taking the bait.
I accidentally stumbled upon an evildoer repellent back in the late 90's. My sis hung some dolls in a torturesome display at my cattleguard. She had a halloween hayride, and my 'station' was the land of dead dolls. Later found that lots of people wouldn't drive down my road.... thinking there was either voodoo or bad juju going on down here.