Bro, I will suggest you to buy an Unregistered one. Because of road conditions in Pakistan. If you buy a registered one then maybe there would be some suspension work or something else. Unregistered one would give you at least piece of mind regarding body, scratches, shining, etc. Off course you need to do some normal routine maintenance like engine oil, transmission oil brake, and other tune-ups, etc.
As for the price jis ki jo marzi wo mangta hai for imported cars. As per my experience, Low mileage car would be at high price as compared to high mileage. You should negotiate with the dealer. If you can find low mileage that would be a great choice but again it will cost you a little more. RS version is a little costly though. I don't know how you are getting the same price for all the variants.
One more thing when you buy the vehicle, do check the engine condition. Normally people import the car and use it for personal without registering till the car is sold so do check the reading on the auction sheet with meter readings both readings must be matched or at least have a difference of 50 to 100 km (According to location) not more than that. Because when the car is on Port it should be delivered to the desired location so add those km into the total readings of the car.
If you are from Karachi or if you can manage to get the car from Karachi to any location I can give a contact of the person whome I bought Vezel last year. He self-imports good cars and sells them at a very reasonable price.
Again I would say Go for the unregistered version 
