120v brewer here. Don't listen to anyone who tells you 120v will give you an inadequate boil. I have brewed on 120v for several years now. Normal sized boils of 7.5 gallons only require a single 1650 watt element to achieved the recommended 6-10% boil off (0.5 to 0.75 gallons in my case).
I can make up to 12 gallon batches using two elements, boiling 13 or so gallons easily.
I use two elements while ramping temperatures to cut down on time, but at the end of the brew day I spend maybe 10-15 minutes extra time because my total rated heat input is 3300 watts instead of 5500 watts.
Something to keep in mind, everything is cheaper on 120v, especially GFCI protection.
Enough rambling. Why not get a Brewtronix Hosehead? 50 amp capable, super compact, and $475. I'm assuming Corey can keep costs so low because there's not as much hardware involved with a controller like this.
http://brewtronix.com/epages/8a95cd...d73-7860-44f3-bf15-555c5378c28a/Products/H5BC