Bob:
Really, my five that I most look forward to playing are the four I'm working on at some stage right now, plus the other course at Streamsong [by that Jimbo Wright fellow].
But if I have to limit it to courses that are open for play today, I would choose Cypress Point, National, Crystal Downs, and the two I've still not crossed off my must-see list, Banff and Jasper. I am almost superstitious about those two, fearing that if I ever do go play them, I might keel over because my list will be done!
High Pointe would be way up on my list if only it were open.