btw, in charleston, gullah cuisine in mt. pleasant is recommended by my nephew and his wife. i hear they have a good buffet: http://www.gullahcuisine.com/ they say they go often after church. knowing them, it has to be good value for money.
There is an all you can eat buffet called Ryan's Steakhouse that have a few places right off 95, which can do in a pinch. Decent entrees, good sides and desserts. Also, check out http://www.chow.com/tour/176