Your post is pretty old, but nevertheless, who would want to play a sorcerer over a wizard? How about someone that wants to multiclass and pick up divine spellcasting as a favored soul? Sorcerer and Favored Souls are both Charisma-based, and it's a sneaky way to get both arcane and divine...
All of these are good ideas, but I'd take it a step further and use these spells and use permanency on them. My understanding is that Permanency's that you perform on yourself or your familiar/animal companion cannot be dispelled, just make sure you use share spell for Permanency when you are...