....and does 100 people mean 100 rooms? How much conference/meeting space needed?
As a Marriott-centric person, my suggestion would be to find one of those many places where Marriott clusters 3 or 4 hotels in one parking lot.......such as a Fairfield, Courtyard, SpringHill and ResInn all next to each other......maybe among the 3-4 hotels in the same corp. umbrella there would be enough rooms and meeting spaces.....