Kona looks great. Our main app (voltageCRM.com) is built in Angular I think we're going to go that route when we go mobile. Any tips/what back end are you running?
We use a true hybrid approach for the mobile app, meaning in addition to using phonegap we also use some native UI elements; namely the top and bottom nav bars. It does add some overhead because you have to write that stuff in java/objective-c but it helps the app feel much closer to a native app than pure HTML5 does at this point. I would check out http://trigger.io if you're not interested in writing any native code and don't have any special requirements for your UI design.