I am running a standard clutch at stage 2+, it was brand new when I bought the car so I didn't pay for it. Tbh it's holding fine at around 370bhp. I give it a easy life though, make sure it's full engaged before giving it any power, but once it's settled it gets full beans and is fine after 5k miles. If and when it goes I will upgrade it. The oem clutch has a nice feel and is light so will be happy the longer it lasts. For stage 1 on a K03 car a standard clutch will be fine, even stage 2 on a K03. As said if you think you might get the bug and go all out then think about upgrading now. Stick with a DMF too, SMF make it even harsher again.