I am sorry to hear about your predicament. Is your home in the development just off Sand Creek Road? I sold one in there last year, and that owner had a very good response getting some issues addressed by the builder. Since it sounds like you have come to the end of the proverbial rope, my suggestion would be to try to remove yourself from the picture as much as possible (putting the dispute in the hands of an attorney). That way you can take a deep breath and hopefully get rid of some of the stress this has put you under. An arbitration may be a more advantageous way to resolve things than trying to jump onboard a class action law suit. Realtors are not attorneys and can not give legal advise, so please contact an attorney to discuss all your options. It will be money well spent.
Both previous responses were correct. We are NOT attorneys and we cannot give legal advice. There are several excellent real estate attorneys who charge by the hour and it would be worth the $150-$250 consultation.
Have you checked with the State Attorney Generals office? They also may have additional information and guidance.