This is a definite mag drill job.
Check out the Milwaukee line, but for what you are doing you could get
by just fine with a smaller Jancy mag drill- I have a Jancy JM 101, and
it is plenty to do this job, but 10 to 20 pounds lighter than a big
milwaukee, and after a couple hundred holes, you are gonna be mighty
happy about that. Plus you save 500 bucks or so.
http://www.jancyslugger.com/index.cf...producti d=56
You buy the drill chuck as an accessory- we routinely use our chuck to
drill holes to tap 10/24, so it will handle a bit the size you want no
problem.