NOE molds are truly a treat to work with- I have 3 of them. You will not regret buying any NOE mold. The high quality workmanship produces very good castings.
MP molds are also very high quality. They are brass, made by a guy in Europe. They are so nice I almost hated to pour lead in them...almost. They make some of the finest castings I have ever seen. It took me almost a year to get the first one- he had a day job and worked on them after hours. He has since quit and went into mold production full time. I would hope that has reduced the waiting time on his molds. Here is a link- if you can afford them, they are worth the money and something to be handed down through the family. I have 2 of them, they are my favorite molds to use.
http://www.mp-molds.com/