Hobgoblin Warcaster from MMV casts spells as a 4th-level wizard and wizard levels stack with that. 4HD, LA +3 (+1 for you), so you'd have all the abilities from the 4HD, including DR 5/magic, monstrous humanoid type (for alter self), spell eater, pillar of magic, hobgoblin racial bonuses, and SR 14. Not perfect because of the 1 LA remaining, but still pretty cool I think. Plus, nobody ever plays hobgoblins anymore.