Re: nymphing line, what to use.
I have been fishing a Cortland BOSS taper and must say, it's amazing.
It will turn over an indy rig no problem, has a super long belly so line control is outstanding and somehow, even with the superb ability to turn over a heavy indy rig, will lay a dry fly down soft as can be. I haven't done much dry fly fishing with it as it's Winter here in Michigan, but I did put a 12' leader on and a size 14 dry just to see how it handled it, was very impressed. I have however fished an indy rig extensively on it.
I strongly suggest it, would make for a great do everything line so wouldn't be so specific when you weren't nymphing would be useless.
I don't do much high stick nymphing or Czech nymphing so if that is what you are more interested in, I can't say if this line is good or bad for that.