Steve Curry,
My own thoughts are that the practice green should mirror what the golfer will find out on your golf course, that the practice green is really the first green on your golf course.
This is contingent upon the luxury of having adequate room, drainage, etc., etc..
Ridgewood in NJ has a great practice greens.
I think GCGC's is reflective of what you get on the golf course as well. Surprisingly, ANGC practice green has all the room in the world, but none of the contouring of the big course, likewise Pine Valley, without much room.