I picked up a Dewalt 14.4 volt cordless drill on the ground at the dump back in the day. It still turned, so I bought a charger for 10 bucks at a pawn shop. Used it until the battery finally did not hold a charge - about 9 mos. later. I coughed up $159 and got a dewalt 18v cordless, and have been using it for the last 5 years. It still runs great, though the bit holder in the handle doesn't grip anymore after a drop from an 8 ft ladder.
I just invested $200 for the combo drill / impact driver with the same 18v batteries and charger. Got the impact driver for those tough bolts, and the blower wheels & fan pulleys. So now I have a back up for my cordless drill, the impact driver, two more batteries, and an extra charger.
Dewalt's website sure sucks, but their cordless drill has worked out great for me.
I still have not found a flexible extension that is worth a darn.