If you are looking at this thread from a financial perspective the original thread makes more sense. At least it does for me, as I also when through this phase of playing around with different types of lines.
In my system, I only use tippet, the RIO spool, for dry fly fishing.
As the tippet is much more supple than other line types that I own currently of the same diameter.
For nymphing, I am now almost exclusively using fluro which is expensive. As I also tend to go through more line and flies when nymphing. For me it made more financial sense to just use berkley vanish in different pound test in my nymphing system.
Another Tip WRT line:
If you add a tippet ring to your tapered leaders it can help extend the life of your tapered leaders.
http://www.orvis.com/news/fly-fishin...the-dark-side/
Hope that helps..