That's a crazy quote for a door alright but the aluclad is nice I'll admit. What's your aversion to a proper timber door? A good quality hardwood door with multipoint locking and weather seals would cost half that amount and at least with wood you have the option of freshening it up every few years with a lick of paint. PVC doors are an abomination in my opinion, especially as the main front door to your house. I've got timber front and rear doors in my house and I recoat them every 3 or 4 years, not a "nice" job but no big deal either. PVC may be low maintenance but it's not "maintenance free". Timber (sourced from an FSC accredited supplier) is a sustainable, renewable resource too.