I dont care much for U/L packs for me its all about the fit and durability. Since you didnt mention cost, I would check out Mystery Ranch at

http://mysteryranch.com/index.php

M/R has outstnding fit and quality. Though some say they are heavy,
I think:

weight,
fit,
durability,

pick 2 that mean the most to you.

and Deuter Packs at

http://www.altrec.com/backpacks/backpacking-packs/

Im going to outfit my family next year and my older son is getting a Deuter.

They are what NOLS uses.