Okay, I am definitely planning to provide:
-Chained Greater Magic Weapon, CL 20 (makes weapons +5, can't remember if I get 20 or 21 targets, if it matters I'll check). This won't work on natural weapons, unfortunately; sorry Xiuhcoatl. It will work on monk unarmed strike.
-Extended Spiderskin for Derk, Rhion, Xiuhcoatl and Simon. Please let me know if you are on this list and will NOT benefit from a +5 enhancement bonus to natural armor.
-Greater Mage Armor for Xiuhcoatl, I think everyone else has armor.
As far as long-lasting attack buffs go, I think the best I can do is Heroics, unless you want to spend 100gp on Create Magic Tattoo from the Spell Compendium (let me know if you do, it'll last two days when extended). The spell confers a fighter bonus feat the target qualifies for. In my current tentative spell selection I have three slots assigned to Heroics: please feel free to tell me your character's favorite fighter bonus feat
I guess we may also want to sell loot at some point. For reference, here's my list from the first combat - Togo, do the bracers of ogre power count as a conventional or unconventional slot, for price? I've priced them as gauntlets of ogre power here, i.e. 4000gp each.
By my count we have nearly 100k worth of gear there, although of course it'd only be 50k if we sold everything.