Re: fly line question
Just checked the auction site. The listing I saw states "TRI-COLOR SPEY", indicating it's sized for double handers. Single hander lines are usually ~30 to 35 yds, much shorter than the length of the listed line. So I'd cross this one off your list.
What's your budget for a line? What rod are you matching it with? How big is the water you're fishing; I get that it's "fast," but how far out are you casting?