The higher cost name brand fly lines seem to be the easiest to locate in a retail setting. RIO boasts that their line meets certain specifications with regards to grains per foot, etc., but, to be honest, I don't require that sort of precision. Close enough will be fine, as I'm not attempting to break any world records.
What about the general suitability of some of the other brands of fly line that sell at a fraction of the cost of the high dollar lines?
Say, for instance, that I'm looking for a wt7 (WF) line with a sinking tip, and fish only fresh water. Does anyone, preferably with some years of experience (so that they have some perspective), have some specific recommendations for me for this type of line?
You folks here are the only fly-fishers I know, so I value your opinion (s)!