I have been trying to figure out what is the best overall HP/AC buff combination that is stackable, assuming you had all available spells?

I was thinking maybe:

Kazad
9s
Austerity (Paladin)
Brell's Stalwart Shield

Does that seem right? Or are those not all stackable? Also not sure how Shaman's Wunshi fits into the mix.

Steeloak
Balikor
BBB
Wunshi
Talisman of Fortitude

Think thats the right list.

Austerity is in the Aego line so won't stack with the Druid HP line.

ward of valiance (ac)
guard of the earth ((ac/ds)i think stacks with coat line)

Steeloak (druid)
Balikor (cleric)
Wunshi (shaman)
Brell's Brawny Bulwark (pally)
Talisman of Fortitude (shaman)

ward of valiance (cleric) is a great AC buff but I do not believe it gives any HPs

My favorite line up for HP buffs

If you really want to be thorough,

Mask
Coat
Steeloak
SoE
Balikor
Devotion
Wunshi
Fortitude
Brell's
Ward
Clairvoyance
SA
Oak (regen)
Seasons
Guard of Druzzil

That about covers it all

I've found Fortitude effect kinda small for me. Hp increase is around 50-60 only.
In a fight where I need all resist buffs, Fortitude will go. Then again, I only have 16 buff slots. Actually, I would rather use our regen if I had to decide between the two.