The BMW M6 is the flagship of the BMW range. A hugely powerful, £80k coupe, it has enormous power (if you can work out the right settings from the iDrive!).
Not really the prettiest of cars it is, never the less, a real competitor in the market. On paper it is more powerful than the likes of the Carrera 2S or the Aston Martin V8 Vantage, but in the real world it struggles to get its power down.
That said, it handles very well, goes like a train and is well made. It will certainly be more exclusive than the M5, but the M5 is a better car.