I've used the Hayn fittings as well as the Sta-Loc, and had good experience with both. The Hayn were a fair bit cheaper, and were easier to work with.
As far as the wire goes, you will want 1x19 for standing rigging
. The others are more flexible, but more susceptible to corrosion
. Dyform is a bit stronger for a given diameter, but also more expensive.
Start with the rigging only website Rigging Only
It has a lot of useful information which you will need. In addition to matching wire size, you will need to deal with terminal types, threads on the rigging screws, toggles, clevis pin sizes, etc. It also has current
prices in US$ and they do ship overseas.