One thing to consider on converting a Kona Dew to any internal gear hub - the Dew has vertical drop outs for the rear axle. That means you can't slide the hub back to tension the chain after putting the hub into the drop out. You will need to add a rear chain tensioner, which is sort of like a derailleur jockey wheel on a pivot below the drop out. Something like a Surly Singleator (sp??).

Don't feel bad, nearly all derailleur geared bikes have vertical drop outs. I bought a Surly Cross Check frame a few years ago, specifically because it has nearly horizontal drop outs that allow an IGH to be used, or a regular derailleur to be used. I built a Shimano Nexus 8 IGH wheel using Sun CR18 rims for about $200. I like it, and it's wonderful in wet, rainy weather because the chain cleaning is minimal (assuming you will also use full coverage fenders like PB Cascadia). I've put about 3500 trouble free miles on it. I just changed out the shift cable and cable housing a few days ago, and it's the only "maintenance" I've done related to the IGH. The shift cable is one thing you don't want to fail and it only takes a few minutes to change, so every 2 years sounds about right. Good Luck!