I had Premier Windows install a number of doors in home last year, and the service since installation has been prompt and cheerful, even though it was minor.
For example, the door hardware on one door had an imperfect finish, and the company replaced it right away. No big deal, no putting us off--just good service.
Premier Windows is a first-class operation every step of the way. My neighbor also had them replace a door, and some windows and had equally good results. We plan on contacting Premier again for replacement windows.
With the way they helped reshape and resize the doorway to my home to help the new door fit in, you can understand why doors are so expensive. But the look and the service that a contractor like Premier Window Systems will give you in that process makes the whole experience totally worthwhile I think. If you use them I am sure you will have the same results.