What racing you doing?? Is it actual strict drag racing of 1/4 mile or more street racing where the distance can be longer or shorter??
Some cars might be better suited to short drags, other to longer drags i.e. some cars are so powerful, you cannot apply full throttle until maybe 2nd / 3rd / or even 4th gear, especially if you are 'street racing' on sports tyres. What tyres are you using, what level of tuning is allowed?
Also, other things to consider is your launch technique, on very powerful cars you need optimum revs for a good or perfect launch, otherwise a lesser car driven by a better driver may beat you.
Without specific details, I'd guess the folllowing:
Road cars:
Veyron
Audi Le mans concept / R8
Lamborghini Gallardo 560 / Mucialago 670SV
Viper ACR '08
Ford GT
Maclaren F1
Ferrari Enzo
Amuse GT1 turbo
Camaro trans cammer
Corvette ZR1
TommyKaira ZZII
R35gtr V Spec
Just fully modify any of these. There's too many to list really, providing more details will help make it easier to be specific
Race cars:
Any 'Le Mans' cars really, Minolta Toyota is a prize car, it's free, why not use that
Escudo suzuki
Formula Gran Turismo
Ferrari F2007 / 2010
Redbull X1