Nearly any of the greats would be the way to go. You can get one done by a 'new' guy, but the will not appreciate in value nearly as fast. Getting one done by Szamboti, Gina, Black, DPK, etc., will give you a great player as well as a real investment piece. Among others, I have an Ed Young & DPK conversion that will NEVER be sold. It either goes with me to the grave when I pass, or gets willed to my kid(s).
On another note, I have to agree with the Jim Buss mention. The man is an artist and a scientist!