If a group is actively "not looking" for one specific class, it's not because that class is unpopular, but because they already have one of those on board. ToS is really popular - and for good reason.
The healing ability of all priests is more or less the same. The difference is more in what they bring with that:
- BS has physical buffs and debuffs, good for soldiers and rogues,
- the PoM has some magical debuffs good for PoMs, Necros and DTs, and also some interesting defensive buffs,
- the ToS has awesome AoE damage and magical debuffs good for Necros, Demos and the ToS itself.
If you rolled ToS - stay with it, it's an very powerful class.
Also, shameless promotion to the ToS guide:
http://forums.ageofconan.com/showthr...Tempest-of-Set