Todd,
I may be able to give you some info on radiant heat. I designed and installed it in our home when we were building a few years back. It is good system, but there are some pros and cons.
Pros; very comfortable floors (nothing like stepping out of the shower on a cold day to a nice warm floor),
efficient (keeps the heat near the bottom of the room where it is needed, especially if you have a high cathedral ceiling), clean (minimizes air / dust movement), no ductwork (1" holes through floors and walls to run tubing)
Cons; price (twice the amount of a forced air system), labor intensive (insulate, insulate, insulate), no ductwork (a/c must be a stand alone unit), long recovery times (will not give an instant blast of heat like forced air, but it also holds the heat longer).
We are heating close to 3,000 square feet in our log home. The basement slab is insulated (bottom and sides). 4,000 psi mix with fiber and hepex tubing tied to reinforcing mesh. It is by far the most comfortable room in the house and the most comfortable basement I have been in. The upstairs is a standard plywood subfloor with the tubing run through aluminum plating in sleepers under the floor. The floors are covered with hardwood and ceramic tile. It radiates heat very well, but I feel the absolute best would be concrete with a ceramic tile covering. Two of the bedrooms are carpeted (thick), so we elected to use low profile wall radiators instead of radiant floor. The bedrooms are very comfortable also.
It is all heated by a natural gas boiler that provides domestic hot water from an immersed coil. I plan to add a high efficiency wood fired boiler with heat storage in the future. I would like to install this in my detached garage and run it to the house via insulated underground pipes. As you can see, radiant heating can accomodate heating needs for different rooms in various ways. Just figure out what your needs are and I think you will be very happy with it.
Good luck,
Mike