We had a lengthy discussion on pike leaders a few months ago....check for a thread titled "Pike leaders" or something to that effect right here in the warmwater section...it was about 3 pages long.
FWIW, a friend and I used 50lb Seagaur fluoro on a recent trip and put it through the paces with all sizes of fish, and we knocked off about a dozen good sized smallies with the same shock tippet. It seemed to be pretty universal and nearly invisible in the water. If you get a chance, check out the Ontario fishing report I started about a month ago right here in the warmwater section.
Regardless of your choice for leader material, good luck and let us know how it works for you.