I think the Wraithknight is over costed for what it does. Observe that it has niether an invulnerable save nor eternal warrior. So even though it has T8, AP2 or AP3 weapons that cause instant death (Distort weapons cough cough) will kill your 240 point model outright. Personally, I'd rather have two wraithlords.
I would take 5 man squads of wraithguard with D-scythes and wave serpents, then have the spiritseers join them. That way, the WG will be able to get close enough to targets, quickly and the spiritseer will be able to spirit mark the targets.
You may have trouble maneuvering 26 jet bikes. They'll take up a lot of space. I'd recommend pairing that down a little bit.
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