A good choice for the list would be Jon Cardwell. He is an all-around climber/boulderer with a great attitude. Check out his overall junior combined score. He has done plenty of hard established routes and boulder problems.
My personal List for the Men Climbers:
Dan Woods
Zeb Engberg
David Lama
Adam Ondra
These Kids could be between first and fourth, the rest are:
Paul Robinson,
Jon Cardwell
Vasya Vorotnikov
Juniors of 2004