Well, I only bought two of the three. So I'll list those.
1976 Porsche 914 2.0
Price: $3,500
Time: 2001
Regrets: I sold the car in 2004, then tracked it down and bought it back in 2005. The only regret was selling it. 🙂
1986 Porsche 951 (aka 944 Turbo)
Price: $7,500
Time: 2005
Regrets: Yeah, right. 😛
Would I recommend either to someone else? Probably not. They're both loud (mainly road and engine noise), ride very stiffly, and have room for only two real-sized humans. I will never regret them, but they aren't very practical and I wouldn't recommend them to just anyone.
ZV