I wouldn't give aluminium doors houseroom (sorry!) as they are thermally disastrous, and inserting bits of plastic to thermally isolate the inner and outer sections just seems a very complex way of using an unsuitable material that will corrode, when you may as well have used a non-corroding, and well insulated material to start with. I have professional experience of doors that are liable to be misused or attacked, including many drug raids, and UPVC just disintegrate under attack, but otherwise are a bit insubstantial and bendy, but keep the weather out, and last for ages. Wood can be pretty secure against casual attack, but only the very best made hardwood doors, and can last well against the weather, with a small amount of maintenance. Steel, well its strong, and resistant to attack if hefty enough, but is corrosion prone, especially if dog piss is a hazard in your circumstances. We had loads of Penscher high security doors rot away in about 5 years, where the tenants and their "friends" pissed against them on a regular basis. Total failure... The fire brigade told me not to worry about them forgetting their security key they'd been issued for all the city's doors, as they would put a towrope on the doorhandle and pull it open with the fire engine. I had to explain that the designer had actually put a bit of thought into it, and the holding power of the magnetic lock was way higher than the strength of the rivets holding the doorhandle on, by design.
So far, I've found the best doors by far to be composite types. Nice and rigid, last well, look OK, always come with fancy multipoint locking, and only averagely expensive. Last one I bought for my previous home was about £1200 fitted.
BTW, I've tended to find the plod were remarkably poor about breaking into doors, and rarely actually looked at what they were dealing with before they attacked inappropriately. I gave talks to some of the relevant ones, on the weak point of most of the doors they'd encounter in our area, and how to get in. We used to work with the local drug squad quite closely, and cooperated on longer term surveillance and subsequent raids. Obviously we had ways of getting in that were usually slower than smashing it, but also usually far quieter.
