If you have a trip to Alaska on the books, make sure that you're ready for the action with the RIO Steelhead/Salmon Leader 3-Pack. The medium-stiff nylon easily turns over heavy flies and provides the tough abrasion resistance big cohos and wild steelheads demand.
Long butt section
Does the job.
Familiarity: I've used it several times
This is pretty much your standard nylon leader, but with a bit more meat to it. I went with the 16lb option and it handled reds and the occasional rainbow well in swift water.