A popular choice for an exterior door is Upvc or vinyl, as it is a virtually maintenance free option. There is now a huge range of glazing and security choices, and a variety of styles and colours as well as white, such as mahogany or oak effect. Many people now have their front door replaced when they have double glazing fitted. Don't forget though that doors are used much more than windows so it's even more important to make sure that you get the best quality you can.