Without question the Mclaren F1.
As someone said earlier- none of us are in any position to make a judgement, seeing as I doubt most of us have even seen all of the cars listed- let alone, have driven even one of them. So for me to say which is the best is kind of like me trying to diagnose someone with a sore throat and a stomach ache.
While numbers do account for something; each and every car listed is properly and comparatively quick. Choosing an Enzo over a Carrera GT because it's 0-60 is .2 seconds faster is really a moot point when you're spending over six hundred thousand dollars on a car.
With that in mind, I take my personal opinions and baises and match them up with what i've seen and read from people who actually do know what they're talking about... Any both them and I agree: hands down, the best super car ever made is the McLaren F1.
Sure, there will always be a faster car, but few will be able to match the near flawless craftmanship and enginuity that went into making the F1. Oh granted, each of the cars listed are superb automobiles, and I would revel in the opportunity to drive any one of them; but at the end of the day- after taking into account all the variables as to what makes a super car great, and even after 10 years, the F1 still wins.
...I've only seen the F1 3 times in person and im almost positive that two of those were the same car (Leno's- the other one being in the dealership in london). I almost crashed upon seeing it, riding in one- i'd probably wet myself, driving one- i'd probably cry with happiness, and owning one- well... I'll let you know what happens when I buy it