Why do you want one of these machines, i have used them in the past and the result is not as good as with a wand and hose, these machines seem to lack pump and vac presure. Have you considered a power brush i use mine connected to 50 ft of hose stand the machine in the corner and clean a whole pub without moving the machine. They tend to have a fairly small solution and recovery tank and generally no heat.
I am pointing this out because years ago we spent a couple of grand on one and it just didnt do the job we hoped.
john