Start by adding more functionality to VV Stock Advisory. You'll save more time and satisfiy a lot of users. The Color Guard first!
The iPad version of Stock Advisory is great but it lacks the Color Guard. The Color Guard is the eye candy of VV. People will tend to stay with the Express Mobile and not upgrade they will use both. Which defeats what you're trying to do. VV Stock Advisory is a great start to offer a Mac version. just keep adding more functionality.If you look at the number of people who want a Mac version they probably have an iPad so making Stock Advisory more robust will make more Mac users happy.