Ok... first off, how many people are you playing with? and who is your teammate the guard guy? try to partner up with the CSM player. ok to the list...
The Blue Scribes - 130
Drop these guys and add in tzerald on chariot with MoS, WaL, Bolt, if you can save points else where add in a second.
3 Flamers of Tzeentch - 105
i would say these are good.
5 Pink Horrors - Bolt of Tzeentch - 95
5 Pink Horrors - 85
10 Pink Horrors - Instrument of Chaos, Chaos Icon - 200
5 Plaugebearers - 75
8 Bloodletters - Fury of Khorne - 138
if you plan on being able to attack anything drop one horror unit, add in a second bletter unit. Also drop BoT off of the first unit of Horrors. Drop the icon and instrument off of the 10 man squad of horrors. add in the Changeling to one. in the list i just threw together i dropped the PB's.
1 Soul Grinder - Phlegm - 160
here you can drop the SG, add a daemon prince with MoT, BoT, Daemonic Gaze. same points cost more effective.
Total - 998
i hope this helps, good hunting
Glory to Chaos