I'm so happy to read what others consider, before offering my own contribution.
Pasatiempo this November was my first Mackenzie course. I'd love to play more of his courses. I'd rank him and Colt (whose courses I've never played) at 1 and 1A, among the old dead guys.
Among the living, I would place Devries number one, as his small number almost insures a shot at a Kingsley, Greywalls or Cape Wickham. Following him would be Coore, Doak and Hanse at 2-2A-2B.