for $$ sake, maximizing Plastic Core troops would be the best bet, followed by using the plastic Chaos Warhounds as Flesh Hounds. Greater Daemons are incredible units which are a steal for their points, but it is really up to you and your brother as to how nasty you want to be with Daemons.
If you dont want "cheese", just dont bring any Greater Daemons or use Khorne/Tzeentch special and rare choices....if you want a vicious competive army, well just follow the reverse! Flesh Hounds and Flamers for all, and for all, a goodnight! + a Thirster.