((( I am a NEW Necrons player, but a long time tourney player w/ Wolves. Also run Chaos Daemons)))
An 875 bringing three annihilation barges is DISGUSTING. Adding in 6 wraiths means you're bringing pain that will be extremely hard to deal with. Ugly for your opponent. Unless you expect a lot of AV13+, drop the one cryptec. Unless you want to get some Solar Pulse action to protect your wraiths, it's not going to do much for you.
5x Necron Warriors, with their meager
Sv 4+, will be toast quickly. I suggest swapping some points around and getting two squads of Tesla Immortals. You're going to be hiding in cover with your little bits of troops, so you might as well get maximum range... even if you need to step back from an advancing threat.
Here is what I might propose that sticks to your theme:
*Overlord, Warscythe,
CCB (195)
*Annihilation Barge (90)
*Annihilation Barge (90)
*Annihilation Barge (90)
*Canoptek Wraiths x6 (3 w/ Whip Coils) 240
*Immortals (x5) w/ Tesla (85)
*Immortals (x5) w/ Tesla (85)
Keep your Overlord in his sweet ride cheap. He's going to be turboboosting around trying to pop vehicles. Use his wounds to repair immobilized results. He's your main anti-tank, but also bait. The more they shoot at that, the more they DONT shoot at your Wraiths. Keep that
CCB moving as much you can!
The rest is easy, just zap-zap-zap and snikt-snikt-snikt. I don't have Wraiths yet, but I would run that at 875. It'd be mean. I dropped the particle caster for points reasons. Half/Half split is okay for wound allocation and have your non-whip coil wraiths die first, obviously.
Maybe that will help/inspire you. Best of luck!