Get a 12v or 14.4v Makita if you dont plan on doing any heavy duty work. You will thank the weight later on. I have a 18v Milwaukee hammer drill and although it's built like a tank, it's heavy as you know what.
My brother in law dropped a Makita from the second floor of a house (electrician) and the casing cracked in two. It was still working so he just superglued the two sides.