well even though at BC release Farwell is getting shelved I still have looked long and hard at the priest class and I am with Dethe  Power Infused Holy is the way to go.  When I first saw the changes to shadow I jumped on specc'in Farwell shadow but since I have played it a bunch I have seen it is very limited as it always have been and the changes did nothing to aid this build type.  But, with a heavy disc  build the bonuses are huge and I have seen way to many + to stay shadow if Farwell ever gets dusted off he shall go Holy damage FTW, or I guess he will once again pull on his heal garb and save the world