If you work in the downtown area, you've got to try the Clay Pit's lunch buffet. I've never been there for dinner, but their menu looks a bit pricey for my pocket book. However, their lunch buffet is affordable and you get a pretty decent amount of choices. Their main dish always changes so you might want to call ahead if you have something specific in mind.
I've heard some people complain about the lack of choices their buffet offers but for $7, what do you expect? Their dinner is way more costly and this way you get to taste a variety of their specialties. You'd likely spend just as much if you went to the Pizza Hut buffet which is way greasier and lacks the quality. I'd say try it once and see if it's for you.