Out of the 3 you listed I think the SR revs the highest, I think SR with the S15 turbo would be awesome for drifting since its small enough that you should be boosting at around 2-2.5k rpms. That should be very predictable linear power good enough for drifting. I also think the SR with S15 turbo tuned properly would give you a good balance of torque and HP. Although the turbo is not big enough for crazy HP, it should be good for drifting..