Gift of Chaos is an expensive, unreliable psychic power. Granted, it has the potential to destroy any model in one hit with no saving throw, but this is much less useful against some armies than others (armies whose commanders have high Toughness). It still might be worth it to keep it on the Sorcerer Lord, but for the Aspiring Sorcerer I'd suggest swapping it out for the cheaper and always useful Doombolt (which makes the squad even better at pumping out S4 AP3 shots).
Overall, it seems like this army is geared toward fighting small, elite armies, preferably with lots of power armor and tanks. I don't think this army would fare very well against, say, orks or 'nids. If that's what you're shooting for, go for it, but I've always been partial to balanced lists.
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