Get the JuiceBox. Run it at 24a on the existing circuit. If you ever get a car with a bigger charger, or move to a new place that needs wiring run, then put in a bigger circuit, and reuse the JuiceBox. Enough people here have gotten the Duosida that it's probably OK, but it seems like the wrong place to be cheap, especially for daily use.
2014 Rav4 EV, Blizzard Pearl White
2011 LEAF SL w/QC, Blue Ocean, returned at end of lease