The problem is this...it's not a Jeep. It's a full size SUV, luxury at that. So any bumper is going to be nearing the highest quality, design, and safety features to begin with. A custom bumper is a good way to go for uniqueness, and to be different, but keep in mind the size of this vehicle and the amount of bracing it will require to withstand a blow when you come off a ledge.
Since a rear bumper is not in my budget, I took a saw to my rear bumper and cut off 3", and added a NATO pintle hitch to the frame. That gives me towing, clearance, and the aftermarket look. I do not add any weight either.