Gut_man,
Have you had a chance to compare the Cast inductors against your North Creek? I had 8awg North Creek inductors ( very good) and replaced them with 8 awg Cast.
I will leave out my opinion until you have conducted your own listening test.
The thread you posted your choice to go with Duelund, you mentioned using Mundorf on the mids. I would also consider using the Jupiter HT or Jupiter VT. For the mids I think you will like this cap.
