Thanks, HM, for the list, I am quite happy with it, and thank you, Vertexx for the comment regarding twilight. I love the weapon, and the ammunition is great! I also like the slippers and the 'hip' bag, as well as the PoP.
Regarding the armor: Having no spell failure chance is even more important to Aden than having no armor check penalty (and this is pretty important, to begin with). Obviously, the invulnerability is worth valuable. It would also help Aden's low hit points. But an arcane spell failure chance is too dangerous -- Aden is a primary caster with access to 5th level spells.
Hm. Difficult. I'm thinking mage armor right now.