Buff stacking with other healers?

[Oldlore]

I box a Bruiser and a Mystic.  A friend of mine is thinking of rolling a Fury and I wasn't sure which of our buffs would stack.  Do the stat buffs from agitate replace or are additive with ancient avatar and our grp str/stam buff? How about the int/wis from the enhance avatar AA and fury's grp int/wis buff line? Thanks!

[Greggthegrmreapr]

as far as I know they all stack.  I don't group with furies that much though...  mostly a warden.

[Baccalarium]

The mit component of the mit buf comes from a line that all priests share.   It will not stack,  but the unique part of it.  small ward, and small hot will.    Its not anything that makes me or any of the druids I've grouped with want to retune bufs, other than the case where sometimes a lower mit buf sometimes overwrites the a higher one. 

[Oldlore]

I know the mitigation buffs don't stack among healers.  I know certain stat buffs don't stack either, such as all the caster grp int buffs.  I'm just wondering how single target stat buffs from healers (avatar, agitate) stack or if they don't.