The game focuses on street racing, drifting, grip racing, and drag racing. Wheelies are not a mechanic in the game, so there's no "best car" for this.
If you're looking for a game with wheelies, you might want to explore other Need for Speed titles, like:
* Need for Speed Underground 2: This game allowed you to customize your car's suspension and perform wheelies.
* Need for Speed Most Wanted (2005): While not a primary feature, you could get a car to do a wheelie with the right tuning.
Let me know if you'd like to discuss the best cars for other types of racing in ProStreet.