It seems alot of people would go with the 2.3/2.4 for the torque but with how weak our drivetrains are and the fact that you can't really rev. past 8000rpms if you are using it for mainly drag racing I would go with a high reving 2.0 built motor. With the extra cost to go to a 2.3/2.4 the power gains are not really worth it and the extra wear on the drivetrain it just does not seem like the better combination.
The fastest turbo and non turbo awd dsm is still a 2.0. The fastest 4g63 is a 2.0. And almost all the fastest dsm's in florida are 2.0s.