Hello, I'm Jason. I will do my best to answer your question quickly and accurately using the information you have provided.
Biggest concerns right this second, with those miles:1) has the timing belt/water pump been done2) any problems with oil consumption?3) yes, clutch wear can be a concern right now, but hard to determine
Other potential concerns: any recent problems with fuel pumps, or check engine lights?
Now, if the belt job hasn't been done, expect to spend about $1k at a good independent Audi shop to have it done
if there are oil consumption problems, pass on this car. I would even suggest writing a contingency in the purchase contact saying that if oil consumption is greater than 1qt/1000 miles, you can sell the car back
If it does need a clutch, expect that to run about $1500 parts and labor