Very good start to an army.
Elites units are where Daemons are freakin' awesome (except Beast of Nurgle).
Fiends bring lots of speed and rending attacks. Bloodcrushers are very durable and scary in their own right. Flamers can be good; while much better as anti-infantry, glances can help if you are lucky enough to stun or immobilize a vehicle.
HQ
So many choices! This almost requires its own discussion. Make sure you investigate Heralds, as they're fantastic for their points cost. If you roll dice poorly (like me), Fateweaver may be worth the cost. I love Bloodthirsters.
Troops
No real bad option. Bring an Icon in each wave. Nurglings and Plaguebearers are great at holding objectives. Bloodletters kill like no one's business. Pink Horrors bring the only shooting option. Daemonettes are my least favorite choice because of T3, but they're fast and bring lots of attacks, if they live.
Heavy Support
Daemon Princes can be great, but up being overpriced. For what the Soul Grinder does with the Phlegm upgrade, I think it's a solid value.
Fast Attack
Hmm. You still have points left? Kind of the last slot to get consideration. Screamers of Tzeentch. Cheap and they have many uses.
I'll be rolling the Daemons out for a 1500 point game Thursday afternoon, and I'll likely find in the evening a 2000 game to practice for the upcoming tournament.