Cutter;
I just completed a barn that is of the same dimensions as the one you describe.
Unlike everyone else I made the structure from insulated concrete forms (ICF) from Arxx. My material costs are around 20 K with insulation, plumping, and insulated doors.
I put the structure on a pre exsisting slab and only poured up sections. I have a fireplace in the garage from the prevous structure and have made a bath room and kitchen area. The idea dog house.
ICF blocks are easy to assemble you can work on your own with extra help only needed on pour day. The other advantage is that the structure is insulated R50.
I have not read through the full posting but radiant heat is good if you want to heat all the time. It will take days to heat up the slab. Use of a hot water tank is good if on gas and gas is inexpensive but remember you get nothing for free. It will take a number of BTUs to heat the barn and radiant heat does not reduce the heating requirements that much. With out careful control of ground water under the slab and insulation it can cost more.
I have an out side wood heater which heats water. It is easy to maintain and works like a normal hot water heater off thermostats. This is an option but again the question is are you going to heat it all the time. I am looking for radiant hot water heat unit I can hang up in the barn and blow heated air from the wood burner when needed.
Another less expensive option is to use a geothermal unit water to water if slab heated. I set up on in the house for ~ 10K heating and cooling. The base units are as low as 3.5K.
For the roof I used steel chicken house trusses and mounted these into the cement walls. In this area wind storms are a problem. The roof is very ridgid.
As with any new construction I made mistakes that cost money and time. If I did it over again I would spend less of both.
E-mail me if you want to see some pictures.

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