Scott DeWar
Prof. Emeritus-Supernatural Events/Countermeasure
what those guys said! i am honored to help you develope your world.
You could take Ascetic Mage and still take Enlightened Fist. There'd be a tiny amount of overlap, but you'd keep the Cha to AC thing, which is quite worthwhile all by itself.
I don't know offhand of any other monk/mage PrC's from WotC published materials. If your GM allows the Book of 9 Swords, there's a decent mage PrC there that you could combine with that core class that gives Wis to AC...I want to say Swordmage, but I know that's wrong. Sword...something. Gah. Been ages since I looked at that book.
Anyway, it's not bad, but it may not be what you're looking for.