Buy at least 4.7 L or 5.7 L hemi, they are good and powerful as per vehicle weight.
Stay away from 3.7 please. Second advise it has bit of plastic in approach and departure angle on bumper, so be ready to loose it some day in desert. Rest all they good and my friend had for 2 years with occasional use in sand including some serious off road in sweihan and Al wagan. They are good in desert, if you are little careful. Good luck and good choice any day over wrangler if space, comfort and number of people is priority