I agree about improving the survivability of the Warrior Priest. Armor, shield, and helm only give a 3+/6++. Armor of Meteoric Iron or Armor of Destiny + shield might be better. If you go with Jarrat's advice and drop the Engineer, I wouldn't take the Helblaster. I think they should always be babysat by an Engineer. If you drop the Helblaster and Engineer, that would give the right amount for a BSB and armor on the priest (185 points). BSB is 85, base, plus two suits of 50-point armor.
Keeping your infantry blocks on the table, and keeping your buffing Priest alive are probably more important than the 10 wounds the Helblaster will inflict.