i just use 2-3 pound berkly or spider line. very low memory, pretty strong, and the same price to get 250 yards of berkly as to get 100 yards of expencive tippet material(10$-15$).
Also for normal alngling there is vicious fishing line which works amazing.
http://www.vicious-fishing.com/vicio...orocarbon.html
I also use actual fly fishing tippet to though.