We did the full standing rigging replacement last year for a little over $11K. That included the shrouds and diamonds. We had one strand of wire break in the upper
shroud, so we did the whole rig since the
boat is 13 years old (and has at least 3 trans-Atlantic trips). We replaced all turnbuckles and other
hardware at the same time. Chain plates and mast step were also inspected and determined good.
I've been up the mast several times, have replaced some wires and
equipment, and know the sheaves are fairly new, so I wasn't as concerned about pulling the full rig and saved a few dollars.
It's relatively painless (except for the wallet), but necessary. From my
research 10-12 years is expected life for
catamaran rigging. Cats put more stress on rig since they don't heal like monohulls. Have your rigger fully check anything you aren't replacing.
If you do pull the rig, consider replacing the wires in the mast.
Pete