$209 Milwaukee 18 volt cordless impact driver on sale at Grainger.com
 

I was at Grainger yesterday and saw this impact driver. 240ft/lbs of torque. Normal price is $340. Milwaukee is phasing out NiCads for Li Ions.

Impact Wrench, Blows per Minute 0-2200, Drill Speed 0-1400 RPM, Chuck Size 1/2 Inches, Recharge Time 1 Hour, Battery Pack Replacement 5PP50, Battery Packs 2, Handle Type T, Clutch Style Ball/Cam, Tool Length 11 5/8 Inches, Tool Weight 9 Pounds, 18 Volts

http://www.grainger.com/Grainger/items/6MR82

I am pretty sure that is the same base unit I just bought. It can be switched over to the 18v LiIon batteries. It works really well for me so far. I am actually looking to pick up the drill that uses the same LiIon batteries.