Oldtimer (or becoming oldtimer)

Hello everybody, I’ve been on it for a while and I’m getting a vintage car. Now I’d finally have a suitable parking space with a connected workshop. He wouldn’t have to have an H-approval even now. So I say until BJ 86 is still in it. Condition has to (or should not be due to the budget) be perfect. Would then sort of have it straightened up gradually. I’m kind of fixed there a little Audi and would ask you for a few suggestions that would make me feel better. I’m really very open about the brand, production country and car series form. The car should simply address me and may be “culty”, or “exotic”! Whether Coupe, convertible, station wagon etc. is first of all a minor matter. The spare parts supply should be half guaranteed. At least there should still be used parts. Should of course be value-stable. Budget would be up to 15,000 €. With the “dream car” it would not be a n 2-3 k € more would fail. But a car that costs 15k € in the purchase and you have to plug in 10k € still does not come into question, if you know what I mean. I’m not sure yet how “perfect” the car has to stand there afterwards so that I am satisfied. This will certainly be a question of the time to invest and the money. I look forward to a few suggestions from you!