The only 4lb test line I use is Cabela's Pro Line in green. I've tried them all and for the money it's the best IMO. But, I do re-spool alot, and cut off two feet every time I tie a knot. Trilene XL is second best for me, in green of course.

I have three UL rigs, 2 Gloomis and a St Croix, and they all have the Cabela's line on them.

Fish don't break line, fisherman do.