I feel like 1500pts is a very nice spot for the Necron army. It seems like if I don't make a list that is designed to beat this one list, I get rolled by his scarabs. It's a mini factory.
3 squads of 10 Immortals with Tesla
6 Wraiths, 5Lash 1 Pistol.
It's bested my basic Eldar list, and my Basic Thousand Sons list. I have beaten it with Orks, but I've also lost to it with orks. I don't know why I'm having so much trouble against it though. Because of the nightfight, he's always got 16 scarabs in his main unit of scarabs, and they have always seemed to roll me. What I can kill scrabs with, he just charges with the wraiths and usually that's it.