Suddenly realized that the Spellthief ACF puts it over my limit on Dragon magazines.
It's not too much to worry about, as the extra five levels of the build (plus the other side of the gestalt) means that there's plenty of room to make up for it.
Speaking of the other side of the gestalt, while the Illithid Savant build would probably be far more powerful overall, I'm probably going to build it towards an Advanced Sharn, as that one gets mega bonuses to its caster level, has insane base stats (to the tune of 44-64), and can pretty easily gain supernatural psionics, arcane spells, and divine spells.