BUY TIP audi 80?!?!?!?!!?!!

hello people! I have a few questions for you … I know a bit in general, but maybe who can help me? I would be very grateful! I have to buy an audi 80. only am I not aware of which ones? – avant od lim., diesel od petrol, switch od automatic, 1.9, 2.0, 2.3, 2.6, … ??? – how many kilometers is a used audi 80 uncritical? I have to spend about EUR 5,000,- before. – and should he have a climate … or is it enough if a second audi 80 uncritical? thank you and love greetings from Austria, MK.