Your budget limits you to older models, such as 2008/2009, which will have done 120,000 to 180,000 km. I am loath to recommend buying one of these cars with such a mileage on them; you would be heading the period of pain when you are quite likely to face increasing and expensive repairs. If you were to choose to buy one I would go for the Discovery. I would also urge you to have the car you choose checked over by a specialist mechanic who knows the brand intimately. Instead of the European models you are considering I would suggest you also look at something like the Toyota Kluger, which would likely to be more reliable and less expensive going forward, and your budget would stretch to a later model.

There's nothing serious to be concerned about with the V8 model, but be aware that it will be expensive to service and repair should you need to do it. Before you hand over your cash talk to a specialist Audi mechanic and seek their advice on the things to look at. Using an independent mechanic will save you heaps on servicing, and they will generally be able to source cheaper parts if needed.

First, this should be a warning to all new car buyers to thoroughly check their car before accepting it from the dealer. Don't be afraid to be a pain in the rear, check it against the order that you placed, and make sure that it is the car you ordered. If it isn't, or there are doubts, ask questions of the dealer and get any issues resolved then and there. If you can't satisfactorily resolve any concerns you have do not drive the car away, record your issues with the car in writing and have the dealer sign them as an acknowledgement of your discussions.

It's really unbelievable that Audi and/or the dealer didn't simply change the carpet and resolve the issue immediately. But as they didn't, the best solution for you is to accept the dealer's offer of replacing the carpet at half cost. While that's not the optimum, in the circumstances it's probably the best you can hope for.