Cabron said..
After lots of googling, SRS in Kurnell, or Ropes Galour, just did most of my Running Rigging... SRS does a 10mm Dyneema/Spectra for a good price, probably not the best, however stronger than most probably need. From RG, got Donaghys in 12 & 14mm for the best price I had seen anywhere.
Maybe cheaper elsewhere for full rolls, however I did a colour coding arrangement so needed cut lengths.
Happy with all products, soft on hands, average stretch, good delivery and pricing
Sorry to be picky, but strength really doesn't come into halyard consideration on a cruising boat, it's all about stretch.
Let's say you have a S&S 34.
Take 12mm double braid, break of around 3000kg.
No way are you ever seeing even half that as a load but at half it's breaking strain, 12mm double braid will stretch about 5%.