Im looking into a 172 clutch and flywheel.

Anyone got opinions on what I should do.

1. Standard 172 clutch from either Ktec or RPD (RPD £33 cheaper at £133) and lightened KTR flywheel from KTEC for £298.
2. Up-rated 172 clutch I.E helix at about £300 and lightened flywheel.

Is the standard 172 clutch enough of an up-grade from the Williams one?