We are asked this question on a daily basis and it an excellent question. We are investors as well in residential and commercial properties.
This pertains to any investment, it is not what you can sell it for, it what you can buy it for.
We had a client that wanted to buy a townhouse/condo and we bought it for $100,000 under market. It was in an excellent location with potential for a great upside. Was that a great investment, yes!
I hope that you find an excellent agent that can represent you. In any new development, the agents in the development represent the seller and will negotiate hard for them. Your agent will negotiate for you and can typically (by a large percent) receive a much better deal than you, had you entered the development alone.
I wish you luck. E mail me if you have any questions about investing, this is my great passion and I have had success.