Welcome,
Never really heard much good Jeep Grand Cherokee reviews but I like them, but love the Cayenne. The X5 has lost it's appeal, if your looking at BMW, try for the X6. I got to test out the older X5 4.8is model and it's more like a sports car than a SUV. I guess the newer X5 will have that sporty feel too.
What are you looking for in you next SUV?