I have a Model S on order, and am still debating the HPWC. I don't need the rapid charging. I like the convenience of having something in the wall, ready to go and keeping the UMC in my trunk. Has anyone looked into third party wall chargers as a solution. This 40 Amp one looks pretty good: http://www.leviton.com/OA_HTML/SectionDisplay.jsp?section=58375&minisite=10251&gclid=CJyojuji2rwCFQHNOgodIhgAjg but is just as expensive as the HPWC. Others I have seen are in the $400 - $500 range, but aren't 40 amps. Has anyone found anything that is less expensive than the HPWC? How about a portable one for the trunk, so I can leave the UMC in the garage?