A shop-style home seems to be popular now. It is a home that has no basement and a larger garage attached to the main structure. Some of these homes have what are called "attic trusses", which are specially designed to provide an area for storage. Other designs have the home built with a second floor in part of the building. . But the most popular feature about this style of construction is floor heat which makes a very comfortable home.
Geothermal water to water units tend to work very well for this type of application, as the temperatures in the loops do not need to be very warm. Once the slab is up to temperature, it is easily maintained at a lower cost with the geothermal. But the water to water geothermal systems are not for heating only. One of the unique features about these systems is that they also provide the chilling for the air conditioning. When an air handler is added, along with some duct in the attic, your cooling needs will also be met.