Hot Link to Mike K post-
http://www.trapperman.com/forum/ubbthrea..._yo#Post4399734 I like the Bosch PS10-2A 12-Volt Max Lithium-Ion Driver Kit-
http://www.amazon.com/Bosch-PS10-2A-12-Volt-Lithium-Ion-Driver/dp/B000PI48AK. It comes with a quick charger, works very well in tight places, especially with head perpendicular to body, light in weight, works an any angle. A charged battery will drive an unbelievable numbers of smaller screws. I haven't found anything that suites my needs better.
EDIT: Be sure to pick up some magnetized tips or screw holder, they sure make starting screws easier.