Which do you need, a cordless drill or impact driver? Of course you need both, at least I do. If you've never tried an impact driver take the time to do so, and time to stand in the checkout line once you decide to buy it.
Ranking: ★ ★ ★ ★ Price: $260 Weight: 7.6 lb Nails (2-In.) Per Charge: 885 Battery: Li-ion, 18-v/4 Ahr Nails (15-Ga.): 3/4 to 2 1/2 in. Likes: It's powerful and drives an extremely wide range of fasteners. Features like a large depth-adjustment dial and plentiful rubber overmold make it easy to handle. Dislikes: Part of its drive mechanism is housed behind the magazine; this distributes its weight in a way that makes it slightly more difficult to pivot than the Bosch and the DeWalt.
Power tool manufacturer Bosch has rolled out wireless charging for 18-volt cordless tools before any of their competitors. An inductive charger transmits electricity to the battery placed atop it, meaning for the first time one doesn't have to disconnect the battery to juice it up.