Buy Seat Leon / Inspections

Hello together, we have decided to buy a Seat Leon 1.8 TSI + DSG. But are we not yet sure whether day registration (20 km) or a used car (1J / 25,000 km). The price difference makes around 3,000 EURO with comparable equipment. Here we are torn back and forth what is better. On the one hand, 3,000 EURO is a lot of money, on the other hand you know with the quasi new car also really that it was not abused before. What do you think about it? What we definitely want to do is extend the connection guarantee at Seat to 5 J (unfortunately later and therefore a little expensive, but ok). A question that asks us, which inspections expect us in the near future with the two variants. On the Internet I researched the first inspection at 30,000 km, but also read in forums that after 1,000 km an oil change is required. S The dealer offers us the first inspection at 30,000 km for 550 EUR, I assume that this is a bad offer or not? Thank you for your assessments.