I do not own a Hustler, so I am giving general advise:
1. Avoid turbo, they are sensitive to fuel quality and more sensitive than NA engines in general. If you have a preferred pump that sells good fuel, and also know a good mechanic, only then go for Turbo.
2. Avoid 4WD, 2WD in Kei cars means the engine is spinning only 2 wheels, so better economy and less load on the engine. Also there are more components in 4AWD system so more maintenance.
This applies to JDM 660cc Kei cars only, not to other vehicles and not to vehicles available brand new in Pakistan.