You probably don't need to upgrade your clutch unless you are going to be doing some more engine modifications to your car. If you want to upgrade your clutch though, I would say go with either the Spec stage 2 kit or Spec stage 3 kit. You can order them from pretty much any vendor, such as Protege Garage or Street Unit, and they are excellent upgrades.
However, you probably don't need to do this unless you are going to be sending a lot more power through the engine than it already has...the stock clutch isn't bad.
Before you upgrade the clutch I would recommend upgrading the stock rear motor mount, the shifter, the suspension, the wheels, or the intercooler. You could also invest in something like the COBB AP or the CPE Standback unit.
In summary:
1) You don't need to upgrade the clutch yet.
2) There are other more practical mods for your car at the point you are at in modifying it: the motor mount, the shifter, the suspension, the wheels, the intercooler, or a adding a tuner such as the COBB AP / CPE Standback.
3) If you absolutely WANT/NEED to upgrade the clutch, get the Spec stage 2 or Spec stage 3 kit from Protege garage or Street unit.