We've got a whole bunchload listed on our
Edgerunners wiki - I just recently finished going over them and modifying a few things. This includes an Organization Stats block comparable to the City Stats block; check it out and let me know what you think. This includes rules for how to determine how much the organization has available to put into, say, cyber security (adapted from GURPS Action 2: Exploits's BAD system, but significantly altered coupled with Social Engineering and Action 1: Heroes's variant rank rules). Links to the appropriate sections of the wiki are included in that linked page.
You can convert that to a Complexity level by using Complexity = Digital Security BAD + Situational BAD, or alternatively the opponent security system's effective skill is 10 + Digital Security BAD + Situational BAD.
Personally, I've decided to scrap trying to use the Pyramid netrunning rules and instead use something much simpler that's more similar to the rules for breaking into and searching a physical space - different skills for different tasks, simple modifiers for the tasks, modifiers based upon quality rather than complexity, etc.