clutch slip

Hey, i am a complete newbie to the whole car world, i am having to replace my clutch as it is slipping badly, i am trying to decide between heavy duty and just your standard clutch, i hear that if you have a heavier duty clutch then it will put more strain on the gearbox etc. is this true? If...

i just booted my EP82 and the revs picked up and didnt move much but then the clutch bite then took off, then smelt like it slipped, the ecu light came on iv tried booting it again and its not doing it now. iv had clutches go before but this seems strange has anyone had this problem?