Manu: Certainly you know me from F-Chat and know that I am no Porsche fan. Of course I would much rather have a 550 over my 911 for daily driver duty. For purely a performance toy, though, I think the GT2 is hard to beat for the $. It's basically in the realm of the F40/F50 for less than the price of the 550/575.
The figures I quote from Road & Track magazine aren't estimates. They are actually times recorded during road tests. In addition, I really must say that the Italian press are the ones who have been known to exagerrate when it comes to the test stats of a certain Italian marque. National pride, you know.
While not a fan of Porsches, they are still very fine automobiles for daily transportation and provide a combination of refinement, performance, reliability, and affordablity that has yet to be matched by any other automaker, though BMW has come close. That said, Porsche owners are no more likely to be pricks than owners of any other car, as I believe Bart has proven with his statements.