i'm running an AP paddle plate with an HKS cover and the jun flywheel on the quaiffe box and it feels really nice. its got a really good feel to it, the clutch pedal is lighter than with the std plate, and its easier to drive than i expected it to be, in traffic etc..
if your not desperate tho i'd be waiting until you can get hold of the OS if you've already got the flywheel.
i spoke to a lad not long ago who'd had an OS put in and there was a little machining involved. but very minor. i dont know what tho.