Thanks for all the info.
I ordered a 32k 5600sxt from 602abcWater. They seemed to have a bunch of good reviews and the limited email contact I've had I've been comfortable with. I also contacted Discount Water Softeners but their only reply was suggesting I buy a Genesis at a 50% higher cost. When I asked why they suggested that instead of Fleck they stopped responding.
Now off to decide on a new water heater.
Assuming it is now installed, how is it working?