This will seem like an odd answer, but here goes.
I have friends that owned a townhouse in Carolina Bay. Their townhouse was built and sold at the top of the market, before the recession. Those townhouses are nice and energy efficient. The older the house or townhouse in Carolina Bay the better. The older construction is energy efficient and better quality materials. Anything newer will be made with lower quality, because the builders are trying to stay competitive with their pricing. Great location and great community plan.
If you want to rent, we have a townhouse for rent not far from Carolina Bay closer to downtown on the other side of 17 on the water. The address is 192 Riverbreeze Dr., Charleston in the neighborhood Waterway South, web address www.waterwaysouth.com