It is also an important ability for Paladins and Rangers as it will directly affect their ability to cast spells. A higher wisdom equals out to more mana for priest style casters. This is the priest equivalent to Intelligence . I recommend that your wisdom is always you highest statistic.
Strength is also important to a cleric if they wish to wear platemail.
So while wisdom is not as important to a priest class as Intelligence is to a mage class it remains the most important ability score they have. I recommend at least a wisdom of 100 and the higher the better.