I think that your Lord is nicely tricked out, but too expensive for a 1000 point game. He'd be over 14% of your army all by himself, and a round of concentrated fire would certainly knock him out of the sky. Also, I agree with Praetor on dropping the lightning claws in exchange for the Flames of Tzeentch. While the twin lightning claws would look badass and make him a decent threat in close combat...that is not the focus of your army. You should be focused on shooting the heck out of anything that moves, not hand to hand. Plus, while he's a mean Sorcerer Lord...he'd be all alone, and he wouldn't do to well like that. I'm not, however, sure that the extra D6 is worth the cost of the Sorcerer's Staff.
I think that you should mix up the Troop Sorcerers' powers. Either give one Bolt of Change and two Doom Bolt, or two Doom Bolt and one Bolt of Change...or some other combo. You want to have some diversity in there, and those extra strength shots from the Sorcerers would definately help.