Living on a lake, I have an open loop system. But, I might have looked into this if I was to do it again
http://awebgeo.com/AWEB85c0.html?file=SlimJim.asp
The amount of energy use for the water pump is trivial compared to the compressor electricity. If your well can maintain the amount of water needed, who cares about the water use.
As far as purchasing equipment, go find a local distributor for the system you want, walk in and buy it....if you have done enough research to know what to buy, and have enough hands on experience to properly install it, then you're money will have welcome arms. If you don't have one or the other, then hire it out.
As a reference, my 5 ton geo system (plus two stages of electric heat which adds another 2 tons) was about $4K for the heater / air conditioner. I also have a 110K BTU propane furnace as a backup for power outages that runs in parallel. The forced air duct work was installed by a HVAC contractor, and I installed the control system and heat plant. We both worked on the plenum connectors. I installed the radient floor heat piping before the floor was poured, but haven't connected that and probably won't.
The house was designed with energy efficiency in mind (other than lots of windows which are energy suckers) so the 5 tons goes a long way. (37 foot high ceilings on main floor, 10 foot on lower level, 6500 sq ft). The garage can also be tied in, but typically I don't heat it. It has it's own propane furnace if I want to work on a project out there in the winter.
When the house was first built and the geo wasn't functional yet, the house was heated on propane. The price tag was a killer....the geo has more than paid itself off.
$80K for heat...wow...I gotta assume most of that is for the wells but even with that...that's expensive. My 170 foot bedrock 4 inch casing well with all hardware (80 gallon tank / 1hp pump) was $4K. It's hard to say that's "too expensive" without knowing all the local issues and contractor pricing. If you had the land, I'd spend half of that digging a really nice pond / lake and look into the plate exchanger...