Here is a new model from Exact Power. I saw it at CES. It is very well built. I believe the price was expected to be around $600. Be sure to click on the "EPDS Solution" and "Specifications" links.
http://www.morriscasale.com/exactpower/products/epds/index.html
http://www.morriscasale.com/exactpower/products/epds/index.html