Yeah my priorities are straight. Why wouldn't they be?
*facepalm*
To answer your first question, Carson Composites offers a significant upgrade package to the Sea King including brand spankin' new rotor blades that are made of - get ready for this shocker - composites. I should note that this upgrade primarily upgrades and extends the actual service life of the airframe (because Sea Kings get used a lot, and are old, so they're getting worn out) rather than as an actual capability upgrade (though I'm sure there's a package for that somewhere too), but for a utility helicopter like the Sea King it pretty much has all the utility you really need straight out of the box. Cockpit upgrades are all you really need, other than the life extensions.
And no, I do not know of any situation where you need a faster Sea King.
For your second question, I do not know.