Our latest main sheet (9:1 system)
3/8" Trophy braid, core removed and replaced with spectra. The Trophy braid cover is spliced into the spectra tail which is just short enough that it does not come out of the cleat when at maximum main sheet tension (pretty much block 2 block).
Trophy braid has a nice hand, good durability and is dirt cheap. We scrounged the sprectra off a friend who picked up a whole reel. We could have saved some money by splicing the spectra into the trophy braid core, but that would just add another lumpy bit to run through the blocks.
Chris.