R8 Race Car '01 > R8 Race Car '05 > C60 Hybride
The C60 Hybride understeers far more on high speed turns (very noticeable on Superspeedway Indy) while the '01 Audi R8 is the fastest around corners aside from F1 cars. The '05 Audi R8 is almost as good as the '01, if I were you I'd buy the Audi or like ReCon*FX said, try to trade for an '05 ticket (and '01 ticket).