I've test driven both, and there is no comparison between the Grand Cherokee and the X5, even with the sports pack I'm a 52yr old female trading-in 99 Grand Cherokee Ltd 6cyl. How's ride, stiffness compare to my Jeep? In City? Highway? (I never go offroad) Is the harsh ride caused by low profile tires, suspension, both? One Dealer is 'warning' against the Sport Pkg because the ride is SO BAD. I've ordered 3.0 Sport Package... want to make sure it wasn't a mistake. Help!