You might go with something like
Blunt
Block
Heavy Armor
Restoration
Alteration
Mysticism
Conjuration (may want to limit it to turn undead)
You will need a lot of repair hammers in the beginning, but the Armorer skill levels pretty well as a minor and will give you a good endurance bump, which will be helpful for the "war" part of your warpriest. Turn undead spells are found in conjuration, so even if you have an aversion to summoning, it can still be a good major for a cleric type character. Some people would even go so far to say that the only time it makes a good major is if you are limiting it to turn undead, since conjuration levels so quickly.