Since healers only get 50% of the normal PvP power bonus, would it be best to save the weapon for last? You lose a pretty significant amount of Int and Spell Power since they're only 470, plus there's no 1H with Spirit.
The pvp power is still desirable even if it's half as effective, it's still 4000 pvp power (upgraded). It's also still a massive amount of spellpower on the weapon. No reason to pass it up unless you have a normal mode weapon or a lfr weapon with a sha gem in it.