Q 697: An orange ioun stone grants +1 to caster level. To a single class or all caster classes? Very powerful for a theurge...
Q 698: Magic/psionic: To psionic manifester levels, too?
Q 699: MIC enchantment rules:
You can add almost every item property to you items, for as long as you pay the enchantment costs. If you add +X WIS to your phylactery of undead turning, it costs X*X*1,000 GP. If you add the property "Emergency Healing" to it, it costs the price of the "Amulet of Emergency Healing" x1,5 (the item already is enchanted). If you add "of Mystic Healing", it costs the price of a ring of Mystic Healing x 2,0 (wrong body slot and already enchanted).
Is there an upper limit on the number of enchantments on a single item? Ten (like a weapon/armor)? His purse? Whatever the DM allows?