Dean's has been around since I was a teenager and took my Senior Portraits. They are a small business but have garned the market in this area for doing most of the High Schools.
They do a good job and make the students feel comfortable, which is hard to do. Most have never had a professional photo prior to this, so this is an important and helpful thing.
The prices are about normal for photos, but they are expensive. The packages give you lots of photos to share with friends and family.