D Hagens, what are your plans for the mill? Depending on this answer, you may find your selection narrowed down some. One builder I would stay away form is the one local to you and I, I have had a bad experience with them and it cost them my purchase.
I don't know about my mill's origins (other than what is on the Norwood website), but one thing I like about it is that most of the wearable parts like belts and bearings are available locally.