I do believe that Ryan would energize the base and be the overall best candidate. Trump would also energize the base to the extent we really need to become a 'business-friendly' country again.
This just in...the base is already massively energized. Would Ryan turn out more votes that wouldn't normally show up? Maybe. I think someone with his intellect and skill set would be better utilized as Treasury Sec. or Budget Director, assuming Romney would listen to him.
I'm not sure how comfortable I am with Trump on step away from being Commander-In-Chief. I see him as a wonderful cheerleader but I don't have a feel for his policies.