Definitely swap the combat familiar on the prince for a spell familiar. Sorcerer should get one too. Spell familiars are nearly the best upgrade in the whole Chaos-Codex

. Best would be to give the prince mastery levels as well and roll on biomancy.
The Chaos Lord so far doesn't really have a use without relic and is illegal as Captyn Bob pointed out. You could simply leave him out, especially since you filled your troop choices with cultists already.
10 warp talons and 10 termis are pretty overpriced choices but if that's what you have go with it. I should mention that if you have 10 warp talons already you might find additional 5 raptors to make the raptor talon formation which improves their use dramatically.
Also, with 9/10 termis you could make the terminator annihilation force (another formation) which is also very good and would be a good use for your lord. Equip him with burning brand of scalathrax and have fun when you fire that flamer twice when he arrives. You won't be able to use reaper autocannons then, but they are far too expensive anyway (25pts... that's 15 points only to make the weapon twin-linked...)
I'm not familiar with noise marines but I'm not sure if you really need sonic blasters on the whole squad you could keep it a bit cheaper and keep some bolters as meatshields.