@Goldfish, regarding Maelor and 8th-leveled spells : would you be fine with him only casting spells as a level 15 Sorcerer? That's still crazily powerful, and it keeps his build much neater (and avoids taking his focus away from his Warlock abilities).
I've just realised that Maelor has 5 levels left after Eltrich Theurge. At level 15 he will effectively be a Warlock 14/Sorcerer 11, and after that if he takes all 5 Inquisitorial Asset levels he'll be a Warlock 18/Sorcerer 15. Not bad! All he'd be losing is a single level 8 spell, but it keeps his build fairly clean (and gives him the Inquisitorial Asset capstone, constant Discern Lies and 5 virtual ranks in all untrained skills). Otherwise I guess he could only take the first 4 levels and then take an extra level of Mindbender or something, but honestly that feels rather ungainly.
EDIT : All builds that give him Sorcerer 16 end up gimping his Warlock progression, which is really what makes him special compared to the rest of our Sorcerers. It also allows him amazing army-killing potential, unusual combat strategies (suboptimal compared to rocket tag of course, this is 3.5, but still worth keeping!), and almost-Evil street cred.