I will wholeheartedly endorse the Berkeley NanoFil line.  Super quiet (almost silent), cast a country mile, no fraying from abrasion, strong, easy to tie, sensitive, no stretch, zero memory - everything you're looking for while fishing from a canoe in the Canadian shield.  It allows quick catch and release w/o fear of losing the fish.  I used the low-vis green, 6# diameter all week with no issues.  Only drawback is it is a little tough on your hands and fingers when cinching up knots.  Really a great line.