As a pure warrior, I did not put more than 5 points in Spirit.
For the first levels, mostly Vitality (Strength only to use better weapons).
After that, nearly as much in Dexterity, Intelligence and Strength until they reached around 40 (Dexterity boosts ranged armor, Strength melee damage, Intelligence boost mana regen and magic damage from weapons).
I put points in Vitality whenever I felt I needed it.
