I cant comment on anything but the one I have. It has been in operation for close to 6 years w/o any problems. I got it from a beer supply place called kegworks.com. I dont use a solenoid. Here is a link:
CO2 Gas Double Gauge Regulator Draft System - Air Tanks & Regulators
If you buy it, I suggest you also get the set of 6 nylon washers for it - an extra $2.85.