Dude, a clutch does not affect total power output on your stock motor.
Lightening your flywheel will improve acceleration, but at the expense of drivability, and safety, as they have been known to shatter from too much load too fast, or otherwise.
I've noticed personally, that when people go for heavy duty clutches on a stock/lightly modified motor, they tend to end up breaking other parts, as the clutch is no longer the weak (cheap!) link in the drivetrain.
Seeing as you got 126,000kms out of a factory job says a lot about your driving style; unless you feel it necessary, I'd just stick with the factory clutch and simply have the flywheel friction surface machined. If you were say, planning a moderate power increase, then maybe spend the extra money on the HD, but realise that next time you drop the clutch hard, it won't be the clutch that breaks!
I've personally had good results from running a heavier pressure plate with a stock clutch, still leaves some sort of "fuse" in the drivetrain while providing heavier clamping.
If you find that you have problems overtaking, I'd first off take a look at your driving technique, I mean, I could overtake just as easily in my old 1l KP60's as I could in my GTSt, you just do as the road code says, (100m clearance throughout the manoeuvre) and you'll be fine.

Daily driver: Toyota RunX/Toyota Caldina
Ex: 2x AE101, 5x KP60, KP61, EP71, 3x KE70, KE72, AE70, AE82, 2x TE71, AE90, AE92, ST170, plus 11 Hondas, 12 Nissans, 6 Fords, 4 Mazdas, 3 Mitsis, an Isuzu and a Lada!
