Priests should only take gear with spirit on it.
RS GoldSpirit was once a highly desirable stat for healing priests, but those days have long since passed. Priests of both spec benefit from gear without spirit on it.
Buy WOW GoldThe only type of cloth gear a healing priest might find undesirable is gear with hit rating on it. A discipline priest's shields prevent rage generation. As of patch 3.1, absorption effects no longer interfere with the rage generation of a warrior or feral druid.Understanding discipline priests. The key to understanding discipline priests in your PUG understands that damage mitigation is a big part of their healing.
RuneScape GoldAbsorption intercepts damage as it is dealt out to members of your raid,
Cheap WOW Goldmeaning that discipline priests will decrease the amount of healing needed on a character. The amount of damaged reduced is usually proportional to the amount of extra healing a normal healing class does. To illustrate this, I put together the graphic below, which shows a normal healing meter and a healing meter with absorbs counted in.