I'm probably going to pick up a 9-wt for casting bigger flies to Pike (trip to visit family in Manitoba this summer). I was wondering what peoples opinions were on what type of rod action casts bulkier and heavier flies best, a very fast action rod or something slower? Or does it make no real difference, its what whatever action is best matched to you and your casting style?

I'm likely to be casting flies up to about 6 inches long and weighing almost as much as the small trout I like to chase.