i use a porter cable 18v. 31 torque ajustments 2 speeds. It also carried the best warranty on market I found of 3 years on a REMANUFACTURED drill. the ni-cad battery lasts me a day or two doing electronic and appliance tear down.
li-ion batteries last twice as long as my ni-cad but are a bit more spendy. i bought mine as a kit with drill, sawzall, circular saw, flashlight, carrying bag, charger (ni-cad only) and 2 ni-cad batteries for $99.99. about $135 with lithium vattery for the set. you can also buy a dual type charger for 25 that can charge either type of battery and just get either type. both types work on the tools.
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