1 point in repair.
Hell spikes are indeed powerful for a warrior/mage.
Rangers are very powerful in this game--I beat the whole game with bow expertise, split arrows, and poisoned weapon--a survivor skill. You have several melee skills that will be useless when using a bow--so if you go melee/ranged use poisoned weapon rather than anymore in those--stun, etc. Poisoned weapon will also disrupt the enemy, something sort of like stun as well as add dmg.