Fireline on a spinning reel, Power Pro on a baitcaster.
Fireline is about %50 stronger than it's rated strength, and about 1/3 the diameter of the same mono test. What this means if you need to be using #4 mono, you can use #6 Fireline, have 8-10 breaking strength, and probably 10 more yards casting distance because it is so slick. In clear water tie on a flouro leader with back-to-back uni knots.
