At the risk of not being very helpful, I will post my opinion on the Planetary Avatar. I do not know the specific stats for this summons but this is the most powerful spell my 31st level solo sorcerer has. I can tell you they have multiple attacks per round (I’m guessing 3-4), a very low thaco since they hit pretty much everything on most of their attacks, and each successful hit carries a chance of immediate death (similar to the effect of the Death Spell). I have seen them kill Lichs in one strike. They are immune to most magic (although imprison is very successful against them) and are immune to most weapons. However, because they are so powerfull you can only summon one at a time. I haven’t tried this but I would imagine if you found 6 Djinnis to pit against one Planatar, the Planatar would make short work of them and come out unscathed. I have sent a Planatar up against a Lich who had summoned a Djinni and had cast similicrum. The Planatar won uninjured. IMHO this is a very powerful summons. However, if you don’t choose it now, you’ll always have a chance to do so later.
To answer your question about sending a party up against 3 Planatars and 3 Divas. IMHO, if you sent a full party, up against 2 Planatars (and they did not use imprisonment) you would have a very difficult fight and lose at least some if not all of your party.
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[This message has been edited by onthepequod (edited 07-16-2001).]