Fit VAG parts, but get it done by a specialist rather than the Stealers. With stuff as crucial as the cambelt and water pump, or anything for that matter, I'd always go VAG. But I don't want top pay 130/hour labour! So I go to Duncans in Byfleet, Surrey, where most of the mechanics are Colbournes trained and all very experienced in VAG work, and the labour is 65 / hour!
Been going there for 15 years, and I know for a fact they are honest.
No Brainer.