What's your budget? You mentioned the new Kona is $1099 - about $100 difference or so. If you're going to buy the bike for that kind of money, buy a new bike.

I recommend the Trek Crossrip, Specialized AWOL, Jamis Bosanova, Salsa Vaya and Surly Straggler as kind of bikes with disc brakes you'll want to look at for commuting.