grant,
i'm not sure if yer on the market and considering a demon but if you have a portable extractor, i can show you how to convert it into a high flow portable for under 100 bucks.
years ago, i was converting old porty's to high flow, and have recently converted one of my porty's to not only high flow, but extreme extraction, along with auto-dump. this current conversion cost me less then 200 bucks.
just the other day, i added 1500 psi capability for hard surface, giving me a total investment of under 350 bucks for conversion to an existing machine that can do everything except cook me breakfast!