Sam:
No sense in trying to be realistic on here ...
If you are looking for marketability for a public venue, you've probably got the top six pretty close, although you should probably find room for David Kidd in there somewhere, or maybe Greg Norman.
Really, though, I'm not sure that too many designers' names carry marketing sizzle for the public at large. My name doesn't have much, although like David's, you get to reference our work in Bandon. Bill Coore's name isn't well known to the public, though his partner's is. I don't even know if Tom Fazio's name is much of a draw for a resort golf course -- where's the mega-successful resort with his name on it? In the long run, a resort wins or loses because it's good golf and not because of the name; and even in the short run, a no-name architect can attract as much attention as the name if the product is great and it's marketed correctly. (See: Bandon Dunes.)
As for cost-effectiveness, you could build these courses for $2 million each, maybe $1.5 million each due to the efficiencies of scale. But are six courses more of a draw than one really good one ... and is there a market for six courses that far out in the center of the country? That's a pretty big leap of faith, and so far no one has had the guts to take the leap.