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The Tzeentch Herald is a Level 2 Wizard who improves the unit's Ward Save to 4+ when he joins them.  You'll find that there is no model for a Herald of Tzeentch.  Mine is an old Black Tree Designs model and you will also find plenty of bird-looking creatures in the Reaper Miniatures range.  However, Games Workshop purists will wish to use a Champion of Tzeentch from the Warriors of Chaos range.  Because he is a wizard and not expected to go into combat, I declare the Tzeentch Herald as my army's General as it is likely the Horrors unit will be centered in the battleline with other units deploying to one side or the other.

19 Plaguebearers of Nurgle are next on the checklist (another Core unit choice).  These are deployed with musician and unit Champion, but I withhold giving them a banner since the Herald will take on that role.  Here, I gace the Plaguebearer standard bearer and over-sized banner and declared him the army's Battle Standard Bearer.  By placing him in the Plaguebearers unit, the entire unit is subject to regeneration.  This makes them quite a sticky unit in combat and I use them as the heavy shock troops in the army.  Although there are plenty of magic banner options for the Battle Standard, I go with the Banner of Hellfire, which issues forth a Bound level 5 spell that can really annoy your enemies while he is using up dispel dice on the Tzeentch magic coming his way (especially if the unit gets into the thick of your enemy lines).  Points-wise it is an expensive combination (486 points) but the cost is only $66.

I go with 20 Bloodletters of Khorne with full command as the third Core unit choice.  They are more nimble than the other core units, but at Toughness 3, they are still rather fragile.  Think of them as Daemon Elves.  They have Killing Blow, which is admirable and a Strength 5, but I find I am usually at the mercy of the opponent (and how our units are deploying) as to where they go and what role the unit takes on.

The Khorne Herald is probably the least impressive of the lot, but he gives the unit Hatred and he serves as a bit of a can-opener if you give him the Firestorm Blade (strength 7) and the Armour of Khorne.  He is a flexible character who can leave the unit and take on opponents by himself without diminishing the ability of the unit too dramatically.  Since the Bloodletters are now plastic models, you can assemble the full unit for $44.  Skulltaker makes the best model for your Herald, but you can also save a few bucks and buy a Chaos Champion of Khorne or a model by Reaper Miniatures if you wish.  This model is a vintage Champion of Khorne affectionately called "Thundercat" by my opponents.

As the Daemonettes are horribly over-priced (or under powered) compared to the other units, I chose to forgo them as a Core Unit selection and fielded them in a unit of 5 Pleasure Seekers (Daemonette cavalry) instead.  This meets Fast Cavalry requirement for the army (with a base speed of 10), but bear in mind they are still an under-powered unit and should take on only the slightest of opponents on the battlefield (other Fast Cav units, War Machines, skirmishers or use them to attack the rear/flank of opposing units).  At the moment, the nice mounted Daemonette models are unavailable- but I would check EBay first.  If not available there, you can convert mounted Daemonettes from a box of Daemonettes and a box of Chaos Marauder Horsemen for $44.

I used to use the Champion of Slaanesh mounted on a Steed of Slaanesh for my Herald, but decided thay Dechala made a better model to distinguish it from my Chaos Warriors army.  She is currently available on the Games Workshop website for $13.25.  I used her as a Herald of Slaanesh on a Steed of Slaanesh wielding the Ether Blade (negates armor saves).  She can deploy with the cavalry unit or strike out on her own.  Her role is to cut through heavily armored opponents- usually by allowing them to attack the regenerating Plague Bearers and charging the unit in the flank where she can cut a swath through them before the Plague Bearers sustain too much damage.

Chaos Furies are a horrible unit- with a measly leadership of 5 it is guaranteed that the unit will be gone if they ever lose combat.  That said, they ARE the throw-away unit of the army at 60 points for 5 of them and can take on the role of attacking War Machines, fleshing out Night Goblin Fanatics and so on.  I field 2 units of 5 (you can by 10 metal models for $40) and usually deploy one to each flank of my battle line.  Usually they are gone by turn 3, but you have to remember their role as a throw-away unit (drawing your enemy's attention so that he's not killing off more expensive deamon models).  And, I have played a couple of games where they came in handy, ran down several fleeing units and survived the game intact.  So, I consider them worth the minor investment.

Flesh Hounds of Khorne are the Heavy Cavalry of the 7th Edition Daemon army.  A unit of 5 is a worthy adversary on the battlefield and can tie up many opposing units (particularly if you get the charge on them).  These are a Special Unit choice, like the Slaanesh cavalry.

As a fan of Chaos Spawn I was initially baffled at their omission from the Daemons of Chaos list.  But, then I realized that most of the creature selections in the Rare Unit roster are like Spawn with Chaos Marks.  Of the lot, I like the Best of Nurgle the best due to his ability to Regenerate.  This makes him more of a moving obstacle that can hold up enemy units or keep a unit busy while another (such as the Bloodletters) gets in position to charge.

The only skirmishers in the army are the Tzeentch Flamers.  These also bring some of of the limited shooting capability to the army.  You'll notice that the unit selection remained relatively even between the different patrons even after I got clear of the Core units:

Khorne:  Bloodletters, Flesh Hounds

Nurgle:  Plague Bearers, Beast

Slaanesh:  Seekers

Tzeentch:  Horrors, Flamers