Definitely support a small local tradesman who really needs the work, not one of those lying pushy nationals with safe-sounding names and the same crap routine of “need to ring the boss” when you ask for a better price.
Look at the very excellent metal/wood/metal composite doors sold by people like Ian Firth. We have one of these without the letter box at the back where it gets hot summer sun and driving rain coming straight off the Fylde, it is strong, rigid, stable, weatherproof, warm and has surpassed my expectations for quality: http://www.ianfirth.co.uk/index.php/external-doors/steel/cottage/cottage.html