I think you have many elements of analysis now to make an informed decision.
I'll add just one thing: if you choose to go mobile (and you really should) I'd recommend to forget about responsive and go adaptive. Responsive is OK, but doesn't cover all the needs for mobile markets, specially when it comes to content delivery. Plus, it's easier and faster to implement and gives you a lot more freedom, whether from a UI/UX POV as from a creativity POV 
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