Where's the next leader going to come from?

One good thing about a Harper majority is that we have time to do things right! One of the most important aspects of re-building a great party is having a great leader, but where will he or she come from? With at least four years till the next election it will be easier for the Liberals to look outside the current caucus for the next leader. While there is great leadership talent within the current caucus Liberals still need to look outside to see who else is out there. I will go over some names in the future but do you have any suggesstions?