I have a Carstenson FL sizing die and really like it. As has been said, send him three pieces of brass that have been fired at least three time and he will send you back what I would call a true custom die. Turn around time is very good too. As far as the seating die is concerned, listen to the other posters and go with the Wilson micro top seater die. They are very nice.
One thing to think about is your current and future chamber dimentions. All the work getting a nice custom die will be for not if the next barrel that you put on your gun is from a different reamer. Many buy their own reamer so that all future chambers will match your custom die. Hope this helps. Bro.D