With apologies to the OP for a minor thread diversion, and to avoid starting another very similar thread...
I too am contemplating such a beastie, but am not looking for the full on 'quacky' sound but something a shade more subtle, which pedals do the cognoscenti advise? Should I be looking for something with a blend knob maybe. Not looking to spend humungous amounts of wonga at this stage, this is more of a trial.