well if I can come up with the $220, I want the Sumo Premier with the solenoid and bubble counter.
If I can't go quite that high, I'll go with the Green leaf Ultimate
http://www.greenleafaquariums.com/co2-regulators/ultimate-co2-regulator.html
If I can't go quite that high, I'll go with the Green leaf Ultimate
http://www.greenleafaquariums.com/co2-regulators/ultimate-co2-regulator.html