I'm building a new home and about ready for the HVAC, I have quotes for the system and am about ready to decide but thought I'd through out one more option..........

I have hot water radiant heat in the basement and garage floors and will use radiant heat under the ceramic tile in the kitchen \ breakfast area and I am installing a 3 zone F\A gas furnace with A\C and I'm planning on heating the radiant floors with the hot water heater but before I commit I thought I'd ask, would I be any better off going with a boiler and a hot water coil with a heat exchanger instead of the natural gas furnace?

The heat calculations for the home call for 3.5 tons of air and 40,000 btu heat loss, the home is a 2 story with 2 bedrooms and bath upstais with open balcony and a bonus room over the garage.

Thanks in advance for any opinions!