I’m not really a “fly line geek” like this article talks about, but I’m a firm believer that matching the right line with your bamboo rods is important.  And, there isn’t just “one best line” for all bamboo rods.  This article is an interesting read, and while I’m not intending to promote RIO products, it should give you something to think about.

http://www.rioproducts.com/blog/fly-line-options-by-mark-raisler/