I think it looks interesting, and I'd love to hear how it works (I'd have to use cardboard to proxy it myself). Some potential changes:
Strip the pistols off the maneaters. If you're going to vanguard/scouting, then you're probably not going to be shooting. Your goal is to be in combat ASAP. As it stands, you have 96 points tied up in pistols. I say stick AHW on them for extra punching power. Also, stick the DHB on the scouting maneaters. Since they can't charge if you go first, you can march up next to something and hit them with the flamer template from the DHB, causing wounds and sticking them with ASL if they try to charge one of your vanguarded units.
Drop the Tyrant and take a SM. This will give you some dispelling capability, and let you move the dispel scroll onto him (you'll see why in a moment). Plus the spells will offer some nice support.
Put the Firebelly on a Flying Carpet. This will turn him into another, near-immediate threat your opponent will have to deal with. Between his breath attack, fireball, and one other spell, he'll be a potent nuisance.
I'd also combine the IG units, and pare them down to the 600 point minimun for your core.