You're probably better off sticking with a prestige class that advances your spellcasting ability. If you want one that combines fighting ability with spellcasting, then the Spellsword in Tome and Blood might be your best bet (even though it's more geared toward melee weapons than missile weapons).
Arcane Archer is not a bad choice, if you have some good spells to use with the Imbue Arrow ability. If you're not an Elf, your DM might let you take the class anyway, as it's hardly unbalancing to allow a non-elf to take it. The requirements are less feat/skill intensive than the Bow Initiate or the Deepwood Sniper, so you can eventually get it with mostly Sorcerer levels, but it won't improve your spellcasting ability at all.