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Go for a solid wooden door or steel door with 10-gauge interior channels, foam filled.

Standard pivot hinges and hardware is fine, just reinforce your door jambs and hinges with this kit:


I know typically we should post links, but it seems relevant to your questions. I have bought these myself and I highly recommend them. The screws included are 4"+ in length. Square tip bit is included (to help with driving that darn thing in the wall). You'll want a bit driver or really good drill, preferably with a hammer setting.

Fantastic product. If you don't want to change your current door, just adding these should do quite well. It also has multiple spots in case you have triple locks instead of the standard deadbolt and knob.