I love huge iron & glass entry doors. I think they make a pretty statement and a great alternative to typical wood doors. As a matter of fact - I have an iron door in my own home.
All throughout Europe you will find incredible examples of iron entry doors. I have so many photos of fantastic, sculptural ironwork! But you don't have to go to Europe to get them. There are many incredible architectural salvage yards all throughout the country in which you can buy them. And if all else fails and you can not find one you are in love with, you can always custom make one.
An added benefit to iron & glass is the fantastic light and view you will gain.