I'm at level 6 on my new warforged wizard. I'm starting to wonder if I would have been better off with a sorcerer though. I've got a +1 arcane sigel docent of moderate fortification. That would make having the wizard feats for the mithral body feat nice. I also wouldn't mind having the insightful reflexes feat. Anyway, I guess my main concern is running out of mana all the time. Is that a problem for wizards end game?