The most important feature of a screwdriver/drill used for hanging drywall is the auto shutoff when the screw is seated juuust right, having dimpled but not broken the drywall paper surface. The second most important is light weight. It's tough to find both features in a tool which is primarily a drill. If you're going to do a lot of drywall work, invest in a drywall screwgun. There's a good review of a bunch of them here: http://www.toolsofthetrade.net/indus...ticleID=501126
They liked the Makita 6824, around $90 online. I wouldn't spend a nickel extra for collated screws.