I too have struggled with all the expensive lines on the market. I work too hard getting a good fish, to just lose it due to a bad knot, kink, or just a bad place in the line.
I've gone back to trilene big game and braid. the braid never seems to wear out, and if it does, just remove it and reverse it back on. the trilene big game is so cheap, I can change it often and still be out less money that most of the others.