The two I would play are Shadow Creek, but it is very expensive, and Wolf Creek.
Shadow Creek because it marked the beginning of a movement that showed to developers that architects could take an absolute nothing piece of land and make something special given enough dollars and taste.
Wolf Creek because it is part of what I feel most everybody should experience along with Black Mesa, The Quarry at Giants Ridge, Lakota Canyon and Tobacco Road. These 4 courses, all feature extremely difficult sites and as part of your architectural education, introduce you to 4 different architects and how they solve problems.
Probably all minimialists will hate all 4, maybe with the exception of Black Mesa, which is the most natural of the group.
As a warning, Wolf Creek has some serious cart path issues in my opinion, but is really worth seeing and playing.