Greg, I have 8 years as a certified carpet, upholstry, fabrich, water damage, fire damage, and odor control tech.
I have a mytee hp100.
Another excelent on is the Hot One by details plus out of portland.
The key thing with the Mytee is to get a decent suction hose, Find a local carpet cleaner supplier or order online 15 feet of prochems replacement hose. It will not seperate when tight bends are made like the mytee stock hose. For that matter every portable hose.
I prefer the hp100 because of the larger heaters, On the Hp60 spyder the heaters get taxed at full tilt all the time. Once the hp100 is heated it is not nearly as taxing on the heaters.
Since your moving up into a HWE that puts out consistant water over 140* I strongly urge you to find chemicals made for hot water usage. They will significantly increase your productivity and cleaning power, while requiring lest actuall phisical work time for you. Generally chemicals are made either to work under 140* or over 150*.