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Well, now if people are talking about breaking in with power tools....

I can't speak to the type of door per se (other than to use steel), but what I can tell you is that you need to make sure you're using long screws to get the door hinges deep into the 2x4s. You'll want to do the same with the strike plates. As for the lock, I personally use Mul-T-Lock. Their Hercular deadbolt has ball bearings on the bolt that keeps it inside the strike plate unless the bolt is retracted by the thumbturn or key. The bolt is fully hardened, so there's no easy way to get through that. The strike plate is also fully hardened. My favorite part is the key. It has this mini springy thing on it that prevents anyone from copying or making an impression without having a factory blank. That will keep all but the most determined of thieves out. And if you do attract those determined of thieves... well... you may have made some wrong choices in life.

If you're on a budget, there are plenty of other locks that are hardened like the Mul-T-Lock. I recommend you go to a high quality locksmith. They'll be able to help you out. I also recommend you stay away from smart locks. They're shiny and full of gizmo features, but they're not as secure as manufacturers make them out to be.