To my knowledge, besides agility you need fate alot since as hunter you run out of power all the time, so I'd consider it 2nd. After that I'd rate vitality, since you will want to last a bit longer after a mob gets to you. A good portion of will shall help to recover after battle, since - in my experience - it always were the hunters which needed a long time to get to full morale/power. As hunter, might I would rather neglect.
Summary of my view:
1. Agility
2. Fate
3. Vitality
4. Will
Of course, some in-combat power regeneration items should help alot, for which you can find some as bracelet or weapons (and shields, which ain't for you).