Both are good bikes. It's really going to be a matter of which one feels better after a test ride or after several test rides.
I've owned several Cannondales, but never a Kona. I have ridden a lot of Kona though. I have always had Kona on my short list when it comes to buy a new bike, but always seem to buy another brand. Usually due to price negotiations.
I would buy a Kona today if the price were right (and I was in the market).
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"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
"Your Bike Sucks" - Sky Yaeger