DC, If the purchase doesnt work out, the STC-1000 build is dirt cheap. I built one in about 2 hours including modifying the box and cutting a custome face for it too. Good luck.
Bob
I completely agree with the STC build. It works with the single-stage version as well. The wired schematic for the single-stage is slightly different from the STC-1000, but can also in that thread.
Here's a couple pics of my single stage controller: