Scatters are nice but not as versatile, I think. The plasma missiles let you hit more models and are AP4. The missiles also have a longer range and are pinning. All this makes me think that they are worth the points.
I think the Holofields might be useful in some situation, but I almost want the Wave Serpents to get blown up so that the Wraithguard can get an assault in their next turn. The Serpent Shield means that you need many hits to kill each Wave Serpent, usually, and with so many transports it will several turns before they lose effectiveness.
I might need a variant of this list to counter Fliers though, because they are a big part of the local meta game.
All that is important is known.