What clutch to use? And can the spigot bearing be upgraded?

There are different symptoms

The symptoms change, depending on the "failure mode" and also what you define as "dying", if you are getting a squealing sound from the clutch I would suggest you have it checked IMMEDIATELY, any delay can result in damage to the flywheel, if this has not already happened.

Since this is a "self adjusting" hydraulic clutch, as the linings wear, you will notice one of two things happening - either that selecting first or reverse becomes difficult - or - the clutch engages/disengages with the pedal closer to the floor - both will actually happen at the same time, but very gradually, so which you notice first is dependent on how observant you are - allow the linings to wear too far and you will get both clutch slip & clutch squeal as the rivets holding the linings come into contact with the flywheel & pressure plate - if this happens and the flywheel is damaged you will probably end up replacing it.

Release & pilot bearings can also make squealing noises - a defective release bearing will typically squeal only when the clutch pedal is depressed, a defective pilot bearing will squeal only when the engine rpm is different to the transmission input shaft speed - because of this you can actually determine which of the two it is - with the car travelling at a reasonable speed, slowly depress the clutch and note when the noise is heard - if it is continuous with the clutch depressed, it's probably the release bearing, if you can get the noise to come & go by varying the engine rpm with the clutch held depressed, it will be the pilot bearing, and if it squeals mostly on moving off from a standstill, it'll either be worn or contaminated linings.

A worn or contaminated clutch can slip without making any noise - if you suspect this to be the case, find a slight incline and drive up it at a reasonable speed, let's say 50 km/h in fourth gear, step on the throttle and watch the tachometer, if the rpm increases without a corresponding increase in road speed, the clutch is slipping - now depress & release the clutch - the rpms should increase rapidly as the clutch disengages & decrease equally rapidly as it engages, a rapid increase followed by a slow decrease would also be a sign of a slipping clutch.

Another symptom of a failing clutch is clutch judder, as the clutch engages a light judder is felt throughout the vehicle - possible causes are contaminated linings or weak/broken "shock" springs - most clutch plates have small coil springs in them that are used to cushion the engagement shock - with time & hard or rough use, they can become weak and/or break and the result is a judder or harsh engagement of the clutch - if they break and separate from the clutch plate they can also jam the mechanism and prevent the clutch from disengaging.

Very cool, Exedy also make a

Very cool,

Exedy also make a replacement which costs just over 200 dollars.