Well, some developments here. One Corvette fell through (while negotiating, the pin was sold to somebody else who paid the full price), so I missed out on that.
But as I posted a similar message like this one on a local forum, I was approached by another guy selling a Corvette for exactly the price I wanted it for.
So I'm checking this one out next week!
And also in response to that same posting, another guy approached my with a nice Stargate that had been in private hands for 15 years and was just restored, asking €850 for it.
Just when I convinced myself, this decision just got tough again. So I think this time next week I will own not one, but two pins more...