I talked to an F17 sailor last weekend, he has all the possible upgrades fitted and its looked pretty cool.

Upgrades:
-Infusion mast (original length).
-New mailsail (to match new mast).
-PBO rigging (shrouds and forestay).
-Carbon spin pole.
-Dyneema trapeze.
-Sheeting from the boom.

He was very pleased with his new rig and said it was a big improvement over the old one, the boom was a bit too long now though so if he where to replace it it would probably be with a carbon one.