At that moment I thought that was the worst idea, I'd ever heard.
This does not quite work, because you don't give a reason why you would think it's a bad idea -- just an un-considered idea.
Capitalize Internet.
Capitalize Duke.
I had taken the best option.
I had made the best decision.
I don't think you "take" a decision.
Nice ending!! How about a little more about what you want to study at Duke, what career you want to prepare for?
:-)