In my opinion, the top 3 verticals I would pursue are:
Financial Services - proven market that will purchase solutions from early stage companies if there is a compelling benefit, can be integrated into their existing portfolio, and can be licensed in such a way that they can easily and cost effectively introduce it to their clients, partners, etc.
Education - to me your solution may well provide a compelling solution that drives student engagement. I closed a global partnership with an Education solution provider that has more than 2.8 million students under contract. Engaging them in new ways is a critical element of our partnership.
Media - the mobile consumer drives (monetized) content.
Please feel free to contact me.