Looking at a Tempstar 2-Stage Variable Speed Communicating Furnace to go with a 2-Stage AC, but am not sure the best stat to go with it. Tempstar makes their communicating Observer wall control, but what am I getting over a Honeywell 8000 or IAQ? It seems like the Observer dehumidifies by lowering the variable fan speed, while the Honeywell's will just take the temp a few degrees lower to pull more air out. Is that correct? What else would there be? What is my best bang for the buck stat? Thanks!!