I think the little 'hole in the wall' places are the best for ethnic food. There's a mexican place across the road from where i work, and it's my favorite. I'm there at least twice a week. It's not a chain restaurant, just a small family owned shop called Burritos and Beer. If any of you are ever in the Indianapolis area, check it out.
Edit: I think there was one week that i went there 6 days in a row, would have been 7 but they're closed on sundays...