@parmnparsley- You may have people tell you that a lithium ion drill is not worth the expense if you live in a cold climate because the batteries have issues in the cold, but this is just not so. I run all of my power tools and drills of 3ah lithium ion batteries that are all rated to -40 degrees. NiCad batteries will often only be rated to -15 or so. The only problems you may run into are with the old lithium ion tools and the cheaper tools. These may experience a problem around 0 degrees or have issues with constant hot/cold cycling.
If you can afford it, buy the lithium ion drill. You will buy fewer batteries in the time that you own it, more than making up for the difference in price.