While Phonegap may be a tempting framework, try not to fall into it's trap. No matter what you'll do, it will get slow. Trust me, I've been there. Just try to display a table with 200 rows and it starts to lag.
You can forget your web experience because what you'll be doing is trying to get a normal web code to work on mobile. Most things will not work as you would expect it to work in Firefox or Chrome. You'll end up doing frustrating optimizations. 95% of your time will be wasted on shouting with your computer
Nothing compares to the look and feel of a native app, especially a native Android app. iOS did not really have a uniform design before version 7 but Android always had one. And there is no need to try and reproduce it with laggy html pages. Go the native way