Metabo has a great line, too. Pricey. A place I used to work was carrying a little cordless 3/8" metabo. It was tiny and had a two-way rocker switch. It had as much torque as a 14v.
ditto hilti on this, one of the installers sent up to help us with a job had a 12v hilti that had equivalent torque, longer battery life, and was a helluvalot lighter than my dewalt 14.4xrp, weight might not seem like a big deal, but when you are working above your head, awkward positions etc, it is nice to have what strength you can muster to push the drill, not just hold it.
http://www.us.hilti.com/holus/modules/prcat/prca_navigation.jsp?OID=-12200
http://www.us.hilti.com/holus/modules/prcat/prca_navigation.jsp?OID=-12199