I have a Kona Dew Plus with (mechanical) disc brakes. Not a lightweight at 220#, I REALLY have come to like the performnce of the disc brakes, particularly in foul weather. I immediately notice the difference when I ride my road bike with conventional brakes, and my Kona has cheap Hayes mechanicals (although I am not sure I would want the extra "complexity" of hydraulic discs).
I came close to getting a Trek FX or Valencia when I happened upon Kona. IMO a much better value. PM me if you would like to discuss specifics.