dispite the name I have ditched the idea of an S4 (although not entirely) for an S3, sold the porker yesterday

and now the desire to get into my new Audi is burning up

. I promised myself I wouldn't rush into this but the burning sensation is just too much. Budget is strictly no more than £12k and the closer I can get to £10 the better. I know this means an early S3 with generaly high milage but then these cars can rack up the miles.
Questions
When and how much is the cam belt service? - also is this the biggest "service" expense there is on an S3?
anything typical of a high miler i need to know (turbo burn out?)
I have seen a couple for sale tuned by Kim Collins any down side to 270bph?
any comments or cars for sale in my budget would be welcome