@Vijaya Kumar Doppa Dubai dealers give 5 years warranty and Abu Dhabi dealer gives 3 years. But it does not mean you cannot extend your warranty. Its just a gimmick the dealers do. Other sellers like Offroadzone and Jeepers source their vehicles from Abu Dhabi hence you will get a 3 year warranty but without service package. My suggestion is to do the comparison between both Dubai and Abu Dhabi dealers with price. May be Abu Dhabi dealer would be cheaper as they offer 3 years warranty and no service package. You can always extend the warranty and also take a service package after buying it. No dealers offers extra 2 years warranty and service package free of cost. They add it to the cost of the vehicle. Insurance do not take from the dealer as it is always higher. Take it from outside where you should save around 2k.
With regards to the which model, Go for Rubicon as it has a stronger Axel compared to the sports and Sahara model hence you will not have to reinforce it. Plus bigger tires, Lifted by 1 inch and Aluminum bumper where you can fix fog lights later on. But finally depends if you would like to spend that amount.
One point for you to remember is any modification you do for any part you lose the warranty for that part. Modification shops will convince you do stuff to your car which is not required and eventually will lift their hands if it is not covered under warranty. Your stock jeep is very capable without any modifications. Just buy a jeep and fix a flag and your ready to go.
Good luck and Great choice.