Bought almost exactly that spec nearly 2 years ago, it had done 112k miles.
It's now done 155k miles and still drives like new.
Cambelt/water pump/tensioners need doing every 60k, so check they were done (see the servie history, not just the sellers word for it) and bank on spending about £350 to get them done again in 5-10k miles.
The engines are good for at least 250k miles so I would be encouraged that its a high mileage as it means mostly motorway which is kind to the mechanicals and you can benefit from a lower price. No idea why people are scared off by high mileage on Audi's, I would much rather have a newer car with high mileage than an older one with suspiciously low miles.
Check the climate control works properly, and it kicks out freezing cold air when on lo.
Not sure on the sport spec, think it included sports suspension.
Mine has the newer style wheels & crusie control (which is a real licence saver as well as a diesel saver).
If it's got the trip computer check the "2" setting to see what mpg it's getting. This might have been reset but worth a look, just blip the button on the wiper stalk (underneath) to scroll round 1 (trip), 2 (long term) and "off", then use the up/down buttons on the end of the stalk to scroll through mpg/duration/range etc.
Should be getting between 42-50mpg depending on type of mileage.