Well, now it's going to seem like I'm just being a lazy bastard - but mine is the Countach as well!
The McLaren is a close second.
I was at Wrightsville beach a few weeks ago, and I actually saw a Countach driving down the street - it was definitely the highlight of my trip. I had always admired them, based on models, pictures, etc., but seeing one in person driving slowly down the street was just an unbelievable experience - and I'm not even a car freak.
They stopped making the Coutach about 15 years ago, if I'm not mistaken, and this thing still looked like it was straight out of a science fiction movie. Truly a spectacular automobile.