Mastery is number one stat. It helps with HPM (heals per mana) and requires less rating than haste (88 vs 100).
Good 660 pvp gear (better than heroic 670 without mastery/haste):
Neck with spirit + mastery,
Wrist with mastery + spirit,
Back with mastery + haste,
Chest with mastery + haste,
Gloves with mastery + haste
Just pugged butcher with last leaves and this settings
http://privatepaste.com/download/c3832513e7 (
49k HPS @ Butcher Heroic 14 ppl (2t,3h,9dps. less ppl -> harder fight), 660 ilvl). Use Incarantion before 90s and later during enrage. Hotw + Tranq is manual too. Bind shroom hotkey. I suggest manual ironbark too. New WG logic is great!
Automatic shroom need some
hard coded logic:
Brackenspore - current one works good (almost infinity mana here),
Imperator Mar'gok, Tectus - manual only,
Twin Ogron - ranged dps group (most stacked),
Kargath, Butcher, Ko'ragh - tank + melee,