I have the Cimex, so obviously I would say get one. I've tried my 175, borrowed an Orbot, used a Icapsol and nothing...nothing beats the Cimex. If you are going to do some commercial encap, why not be the best, that way you'll be doing it again and again. The Cimex paid for itself on it's first job for me, but even if that was not the case for you, it would pay for itself relatively quickly.
The Orbot with the Sprayborg I used was the closest in performance to the Cimex and may be slightly more versatile, but for the price difference, I would get the Cimex any day. The Orbot will also chew through the
Fiberplus pads really quickly.
When you do have that really nasty residential, the Cimex will pre-scrub MUCH better than the 175 on it's own, so there are other uses for the machine, but it is really mainly a commercial office building encaping work horse.