Hmm.
One thing to note about Necrons in general is that our effective range is 24' with almost everything, meaning that you need to have some contingency plan for when your opponent decides to answer your mid-range aggression with a CC punch to the face. From what you have here, it seems like your preferred answer is to punch back, which is fair enough and I wish you luck with it--Spyders have done decently well in my limited experience, and Wraiths sound like the bees-knees from what more new-dex savvy players have been saying. You might consider finding some room for Scarabs in here since your Spyders would pump up the unit size for free, and the Scarabs themselves would provide you with a good tarpit unit in case you need to delay someone trying to cross that 24' too quickly.
Another option you should take under consideration in terms of army direction is the obscene mobility currently available to your Warriors and Immortals. Our transports are very good, and they're a great way to get your troops to objectives or to just generally sow terror among your enemies. The Nightscythe is ridiculous, wielding a fantastic armament coupled with flyer status and the ability to cover an amazing amount of board-space before disembarking its soldiers. The Ghost Ark is a more conventional sort of transport, and will move around the board more slowly, but with ten Warriors-worth of fire built into the tank, plus the passengers shooting out of it (it's open-topped), it provides a nice little gun platform for shooting your way up-field.
As for posting everywhere, I can say with some certainty that the Necron forum appreciates the attention. It's been slow and I can't imagine anyone taking issue with a splash of activity.