I did construction contractor work for a year, I got an 18v Dewalt XRP kit (2 batteries, cordless drill (500 IP torque hammer drill, circular saw, recip saw and light) as a wedding present from my Father in Law (a very successful remodeling contractor) the guy I worked for had a sears kit (made by Ryobi) and the other laborer had a Makita kit. When something was too tough for the other kits, both guys would borrow mine. Sure the batteries are expensive, but my first pair lasted 4 years of constant use, I have gotten serious value for the money. I bought a used second kit at the local pawnshop so I would have a kit to keep in my truck. The Dewalts have survived all sorts of abuse (drops, soaking etc. the immersion was when I decided to no longer let my co-workers use my tools) during the year I worked for the contractor he replaced his Sears drill twice. YMMV My money goes to Dewalt for their top-of-the-line tools.
-Page