It is a Realtor's job to provide knowledgeable market information to you. Are you in a signed contract with your Realtor to have them represent you? If you are, then they need to advise you or release you from an agreement. If you are not in a signed buyer representation contract, then I would be happy to talk to you over the phone and see how I can help you! I know Frisco very well and I always strive to save my clients a lot of money and have been successful in helping clients build wealth and equity through Real Estate for many years now!
If I can be of real estate service to you, please pick up the phone & call me today!
As far as the builder, you can check with BBB, In my experience, everyone has a horror story about one builder or another, but it's usually isolated incidents. Do your due diligence as always. Good Luck.