Do not do like I did and concentrate 100% on agility on the way up.
We also need Stamina (for greater health for when things go south) and Inteligence (to up our mana pool for those really long boss fights) and attack power to up our damage meter results and live up to our DPS expectations.
The down side is you do not get to see a whole lot of equipment with more than one stat on them until well past 60 in most cases. But still be on the look out for it and do not hesitate to get a piece with really good stamina or intelligence and no agility at all. It seems the really good Mail pieces with these stats are pretty hard to come by . . .
Agility is great for us Hunters but we also need stamina, intelligence and attack power for the level 70 stuff it seems.