Sup, /tg/?

I'm currently in the process of making a Dark Eldar army and I came across a few questions.

1) How viable are Beastmasters and what are the best beasts to use.
2) How would they work on the table?
3) Is a succubus worth taking when you have Duke?
4) I personally dislike the Humunculi models and until they get new models I wont be fielding them, what is the best HQ and how do I use them to effectiveness.
5) what's better 10 warriors(Blaster/Cannon) in a raider or 5 warriors(blaster) in a venom(dual Cannons)?

Thanks for your time.