I would buy a little, cheap, popular petrol car. A Fiesta, or a Corsa, perhaps. The bits are readily available for not too much money.
I had a Corsa, bought by my dad in 1996, which I bought off him after he'd done with it. I did 114,000 miles before I sold it, and apart from an exhaust falling off it never once broke down, ever. :shock:
Mind you, all the other old cars I've owned before were comparatively rubbish. Most of them were much more exciting to drive, cool, etc. but really, none of them were as good a piece of engineering as that Vauxhall.
Glad I don't have a car now, though; if you can possibly avoid owning one it makes life much easier.