I'm not familiar with the Crystal Scaler, however I do have an Iscan DVDO Plus, V2 that I might be getting rid off.
It is in mint condition, rack mounted, non-smoking env. Original box and manual.
It uses the Silicon Graphics chip, which is pretty well respected. Details at www.dvdo.com . I have a 2m breakout cable from bettercables.com that would come along with the doubler.