For instance, a law school may be 4th tier in the national scheme of things, but in the town its located, there's a good chance that a lot of people in the profession went there. So, it's regarded as being a competent local school, versus a not-very-good national school.
I know a few people that attend U of South Dakota, if you have been accepted I suggest attending (based on what you described as your options). I think it offers a quality legal education at a good price.