Best K Swap exhaust manifold

I'm sure this topic has been covered already! Anyway im doing a K swap on a Honda CRX, I'm looking at which exhaust manifold produces the most HP? I've heard ASP are good but very pricy but for the money Skunk2 alpha series, mega power, or Ktuned 421 manifolds are also good contenders for the price?

I'd probably get one made up by solid fabs.