The SSC Aero has held the title of 'Worlds fastest Production car' for over 2 years now, the the Veyron still a close second.
There is another car in the final stages of testing.. can't remember the name, but it is said to knock even the SSC Aero of the perch.. has a crazy output of around 2000HP if memory serves.
Keating TKR, 1800HP and already faster that SSC in testing.