Other Prestige Classes you might consider (this is not a commentary on any recommendations or opinion as to value) due to your qualifications are Geomancer, Rage Mage, Bladesinger, Spellsword, War Chanter and off course the Eldritch Knight. Most of these are found in "Complete Warrior".
If any of those titles appeal to you and you cannot get your hands on the book or find the details on line, I would be more than happy to discuss it further.
The key to a Prestige Class is, does it fit you and will you benefit from it (whether that benefit be mere enjoyment of playing something unique or actual game advantage) Merilin perfected the Arcane Archer and at least four other characters were working towards PC's, including 2 who wish to be CFI PC's.
If you have a special concept for a PC to fit Kel, I can also , with your input, design one that may appeal to him (though that has had only a 50% success rate in the past).
Personally, I don't see much to the Eldritch Knight and don't see Kel going that way (I could be wrong).
I am sure some of the other players will have their own advice...at least I hope so, because I would love to hear their input.
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