What would you guys recommend to max, and in what order, as a post-BB Dark Knight?

I don't think it really matters what you max now. You're going to have a full SP reset anyway. Get what's good now for now, later for later.

Ya, I play KMS. Oh, btw, just a quick thing I noticed today. Beholder's mastery is NOT passive. Beholder must be out to get the mastery bonus.