150's a reasonable price for the sachs clutch. should hold a tune on top of your nozzles. But your turbo's your biggest restriction now. PD150 turbo ;).
 
It would need to be a vnt15 minimum, my mate can get the recon for £250 but not sure if you need to give them like for like i.e. would they take a wg turbo in exchange? If not then obviously there'd be a surcharge that you'd have to pay.