My two cents... since I'm running the same type of army but at 1,500.
Drazhar is quite the monster in some senses but fails in many others, not really worth the huge point sink, you could potencially get a beefed archon/succubus + extra stuff for the same price.
Your Venoms are your backbone, get rid of the Sybarite upgrades, they really don't offer much but an extra CC attack, which you don't want them in CC at all anyway! so it's pretty much a point sink.
I like the Scourges, they provide quite a lot of potencial but will be focused a lot so I hope you have a plan and a backup plan for them all the time.
Jetfighter - It has the potencial once more to be good but at 1,000 I don't think it's really worth it.. especially since it won't be on the field untill turn 2/3 and then unless you line it up perfectly you're only gonna have 2 turns of shooting with it - perhaps invest into something else?
sKP