I have drilled HUNDREDS, if not thousands of holes on concrete. A hammer/combination drill will kill you. I highly recommend a rotary hammer for sure. Especially if you're going to be drilling holes closer to the 3/8"-1/2" or larger that I anticipate you'll be drilling for sill plate. If you don't foresee doing any work where you'll need a battery ie, no power within 50-75 feet, a corded rotary would be your best friend.