hey mate just got my 2001 s4 serviced- the 40'000km one.
i live in dubbo but don't think anyone here is reliable, so i got it done in bathurst.
great western motorcycles. mechanic says the 10 thou services are more of a quick check over and every 20 thou they do a major. being tyhe 4 valve motor there was a fair few hours spent on the valves/ cams and it came to around $700 in labour, and all the fluids, filters and belts changed (incl. fork oil) it ended up about $1500.
but a 10000 on a 2valve motor should be alot less trouble im thinking
edit/ sorry that price also included a front tyre @ $190