Staff: Staff of Magi, kill the female wizard in the Twisted Rune
Belt: Perhaps Girdle of Piercing (?), lesser chance of being hit by arrows.
Robe: Robe of Vecna, by from Bonus Merchant in Adventurers Mart. If you have bhought BG2 Collectors Edition, you get a CD where you can install the Bonus Merchant. Otherwise, I think you can dowload her from Baldurash.
Boots: Boots of Speed (?)
Helmet (If there is one): some Ioun Stone
Rings: Ring of Wizard (made either by your apprentices or obtained from one of the wizards in Jaheiras Harperquest)
Ring of Gaxx, loot from Kangaxx
Misc: Amulet of Power
Aelia Jusa, the ring you take from Lavok is NOT a ring of wizardy, it is the Ring of Alacricy (spell?)
It is not as good as Wizardy, since First, second, third and four-level spells isn't very powerfull. You have enough slots for what you need.
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We call him Bobby Corwen