I'm using an STC-1000 that was flashed with the STC-1000+ firmware. I picked mine up from blackboxbrew.com. For the price it has amazing features. It has up to 6 profiles I can preset, controls heating and cooling, ramp up/down feature. You can buy a prebuilt controller unit from them, but they don't seem to come up for sale too often. I picked up just the stc-1000 from him and built the rest myself with about $10 worth of parts. It's a little complicated to use, but once you get your profiles setup it's a set it and forget it type of deal.