It's not all about the voltage - This is a beast - DEWALT DC727KA Heavy Duty 12-Volt Ni-Cad Cordless 3/8-Inch Drill/Driver Kit
 

Bought this drill on sale at a large home improvement store for about the Amazon price. Nowadays everybody talks about the "voltage" implying more is always better. Whats next? 48 volts? Come on. Discount Cordless Drill Batteries | Cordless Drill Battery | Best Cordless Drill

I considered the 18 volt version but let common sense prevail and got the 12 volt unit. My objective was a good, solid, powerful drill for general usage around the house. I wanted something I could manipulate easily and which didn't have a humungous battery getting in the way. I can tell you this 12 volt drill is a beast. I'm a serious woodworker and home repair type of guy and this drill is perfect without the ridiculous size of the higher voltage types. Nice balance in your hand so you'll feel comfortable grabbing it for many jobs.

The charger is fast and the batteries last a long time between charges.
Don't get sucked into the voltage hype. Buy this 12 volt unit without hesitation.