I would probably do a Sunday brunch rather than a dinner buffet (but we've not done a dinner buffet, only had dinner there) - we really enjoyed Sonya's Sunday brunch year before last. Seems like at ran about $27/person (I may be mis-remembering), but it included a glass of the bubbly....
They had a wide selection of items, roast, pastries, seafood, salads, egg dishes, etc.