How to determine the correct arrow type?

[Rustywreck]

The spine (stiffness/flex) of the shaft is the first thing to look at. Many things effect the spine of an arrow, including the shaft itself and essentially everything that attaches to the arrow.
If wieght is an issue for you, as it is to many people, that would come second - it doesn't matter how light the shaft or fast the arrow if it underspined and doesn't shoot straight.
All the shaft manufacturers have charts to put you in the right neighborhood. Easton's chart have some flexibility in them.
I have accumulated a bundle of around 100 shafts that I am slowly giving away.
Myself, I have switched back to aluminum shafts for hunting. I have used graphite/carbon shafts, but have come to prefer aluminum for hunting.
My bow draws 72lbs and I use 2413 shafts. I have found aluminum raw shafts to be consistantly straighter than graphite, making them easier and quicker to tune broadheads. The extra weight of the arrow absorbs some of the vibration of the bow, making the bow quieter and smoother to shoot.