Some Xenarc PCs (if not most of them) are actualy re branded Sumicom PCs (
http://www.sumicom.com.tw), which are sold by
http://www.logisysus.com/
and
http://www.cappuccinopc.com/default.asp.
I bought mine from logisys, been testing it at home and its fine, will test it in my car in a few days and let you know.