Well, it's really harder than that. If you're shooting for optimal. I've been playing for a long time and I still stress over buff combos, especially when you throw clicky buffs into the mix. Some don't stack, some overwrite each other, etc., etc. Then you have #buff limits, unless you've invested a lot of AAs in raising that cap. Sure for HP, mana and AC there are a handful of key buff spells from cleric, druid, enchanter, shaman, paladin, beastlord but beyond that it can get somewhat complicated. Of course, it's effort vs return at that point as some extra buffage doesn't do all that much: same issue with swapping out and adding new augments, you wonder sometimes if it's worth the expense and trouble when a new aug adds 10ac and removes 50 HPs, for just one of many examples.
I agree wholeheartedly, though, the info is out there for the curious and good advice is: "Seek and Ye Shall Find!"