Next in line for pricing will likely be the UPVC double glazed door, followed by composite doors and then aluminium. ( see more detail here: Cost Guide For Double Glazed Doors)
For security, you should look for a product with at least triple hinges combined with multipoint locks alongside a 3 or 5 lever mortice key lock
Double glazed patio doors will bring in loads of natural light – even on the dullest of days (maybe saving you some money on your lighting costs?).
Go read this article to find out more: The top 5 reasons to fit new UPVC Patio doors to your home
It is true that strong doors would make a not so good house a great dwelling, as much as crumby ones which would transform a million-dollar building into something much lesser.
The best choice for a superior back or front door should always be a Composite Product (for more information).