It's the little things that mean the most. Here are two options for an ideal titanium safety wire set up.
Standard .032" diameter (20 gauge) titanium wire in a 25 foot roll. This comes with comparable strength to the stainless wire most use but with practically half the weight... plus it's TITANIUM, what's not to love.
Lightweight .025" diameter (22 gauge) titanium wire in a 50 foot roll. This is not as strong as the .032" wire but has plenty of strength to hold bolts from loosening. The biggest benefit with this wire (besides even less weight) is the easier installation through tight bends and aligning through drilled holes in fasteners.