Check this thing out...retail price is $400 but it'll sell for far less than that.

http://cgi.ebay.com/ebaymotors/Milwaukee-Impact-Wrench-1-2-drive-14-4-Volt-Cordless_W0QQitemZ4613761690QQcategoryZ35000QQssPa geNameZWDVWQQrdZ1QQcmdZViewItem