I think Bemused is right in terms of what one of the (if not the) most expensive edges.

We're not normally in the business of handing out exacts on edge costs and the like.

So all I'd say is this:

How many EP is the most expensive edge? A lot. There are a chunk of current characters who could have taken it, or soon will be able to. So expensive edges are doable.

The system is made so you can't math out which exact edges to get, so I'd just pick the edge I want(ed) to experiment with, then grab the cheaper edge afterwards if I can.

-Ish