I see a lot of people knock Arthur Murray on this board, and let me tell you about my experience with them.
My wife and I started taking lessons there almost 3 years ago. We knew it was more expensive than some other studios, but we really liked the location and our instructor.
As we moved through their program as a couple after about 6 months we were really getting the hang of it. We had no prior dance knowledge at all. So we decided to stick it out awhile longer.
Needless to say we will have been there 3 years in another 6 weeks. We are at Bronze 4 level, and everywhere we go dancing we stand out in the crowd. We get a lot of compliments from other dancers who have been doing this for a lot more years, and who have taken lessons from other studios like Glenn Clark, Fred Astaire and others. When I lead a woman I don't know and have never danced with before she follows me with no problems.
All I can say is we have nothing but positive experiences at our studio and feel it is worth a little more money to get the kind of quality teaching we have had.
Our studio is in Royal Oak, Michigan and I will pit my dancing against any guy who has been taking lessons for the same amount of time.