I am a fan of the new destroyers. Combined with things like the ctan worldscape power, forcing people into the open and then blasting with ap3. Granted, they are not nearly as good as before, but they do have their uses. One of my good Necron general friends just uses them as cheap fodder for the heavies now. Making them last longer.
As for Imhotek, the potential that lightning has is fantastic! Also messing with alfa strikes is great. But sometimes a simple solar pulse will do the job nicely for cheaper. IMO some of the best items in the book are cryptec ones... the -D3" to charge is one of them.