One month and 25 responses later the lifelines are in the garage. Sorry, but this old guy went conservative and matched(almost) the original. I bought coated 3/16" wire with the 1/8" coating. So a 5/16" wire instead of the original 3/8". I think that I can live with the 1/16" difference. Seems that is what is on all your new boats.
Total price from Seco South was $245. plus $19. shipping. They shipped both sets, old and new, in the same box. Any reason to keep four old wires, each over 32 feet? I was thinking I would take it to the marina tomorrow and give it to them. At least they have a dumpster.