MkV Golf GTI belt and water pump change - where?

[bigandclever]

Just after some thoughts on where to get the timing belt and water pump done for my Golf. I've simplified to 3 options:

At VW dealer
Walkable from home, fixed price £479. I know occasionally they do deals, but nothing I can find at the moment. Positive is it gets a VW stamp and 2 year warranty which I assume is worth something.

VW specialist
Say AmD (who have done work on the car in the past) or Awesome GTI. These would require driving to and waiting around, so would cost me a few hours hanging around plus petrol plus about £350.

Local independent
Servicing and MOT is done at a local indy, and if they hadn't quoted £586 (!) they'd be doing it.

What would PH do?

[bigandclever]

I'm leaning towards dealer too, but I did forget one (possibly important) detail .. car has a Caractere bodykit and a quad exhaust on it. Will the dealer be able to cope with that? Suppose I could just ask