There are some laps I've done on Nurburgring Nordschleife with these type of car, just to contribuite to the discussion:
05:23.311 Toyota Minolta Toyota 88C-V Race Car '89
05:24.832 Mercedes Benz Sauber Mercedes C9 Race Car '89
05:26.632 Nissan R92CP Race Car '92
05:28.950 Bentley Speed 8 Race Car '03
05:30.195 Toyota GT-ONE Race Car (TS020) '99
05:31.170 Peugeot 905 Race Car '92
05:38.064 Peugeot 908 HDi FAP - Team Peugeot Total '10
They are all stock with oil change,the used cars are with engine and chassis overhaul, all times done without assists except abs=1, racing soft tires, grip set to real.
The Minolta is the fastest, I can feel it immediatly when driving it, it has something that the other cars doesn't have, and isn't neither the most difficult to drive. I also love the Sauber, crazy acceleration, but has less grip than the Minolta. The Peugeot 908 is so stable, the easiest to drive, also the slowest (but I expected it, because it has the lowest HP amount). I was surprised by the Bentley, is easy to drive and crazy fast.
At first glance I expected the R92CP to be the fastest with its 1000 HP, but you know, power is not everything, and this is the demonstration.
I tried also the Jaguar and the Pescarolo Judd, but they are too much understeery, I don't like cars that are this fast and that has this stupid understeer. When I'm inspired, I'll eventually give them a try again.