Hello, I'm new user to DakkaDakka

and I need some help. I play
WH40k for 2-3 years and still have dilemma when i need to build up army list. Im in love with daemons of Khorne and Tzeentch, so I use only them. Here what I have from daemons:
HQ:
Daemon Prince - Tz, wings
Daemon Prince - Khorne, wings
Skulltaker
Karanak
Herald Tz
Herald Khorne on Juggernaut
Herald Khorne
Troops:
19x Bloodletters
13x Pink Horrors
Fast:
10x Fleshhounds
Elites:
6x Flamers
5x Bloodcrushers
Haevy:
Soul Grinder - Khorne
Mostly I build up army for 1250-1500pts and take:
DP - TZ, 2mlvl, wings, arm, g-reward, e-reward
Karanak
Herald Khorne - Juggernaut, g-reward, some locus
Herald - Tz, locus (+1S spells)
13x Pink Horrors
10-19 Bloodletters
3 Bloodcrushers
5-10 Fleshhounds
3-6 Flamers
Soul Grinder - Khorne, Phlegm
Second
DP (with
MoK) is new so i never use both
DP in game. I planning to buy Lord of Change (then use
DP as
HS), more Horrors and Bloodletters and Skull Cannon.
What do you think about such army list?
What should I buy in first? Another
HQ or troops?
And no - I wont buy Nurgle daemons

(for now)