The current issue of WoodenBoat has a really good article about using galvanized wire for rigging…
I mention this because I just spent a kiss over $50 each for four new 1/2″ stainless turnbuckles which, while cheap for stainless, it did not escape my notice that galvanized turnbuckles were a whole lot cheaper. Which underlines the fact that a galvanized rig is going to be cheaper for a stronger and longer lasting rig providing you do it right.
Just to disabuse you of the fact that I’m spouting nonsense, I should point out that Brion Toss makes a rather compelling case for galvanized wire in his “The Complete Riggers Apprentice” which everyone should have a copy of on their bookshelf.