Very good choices there..........my 1st choice would be the '04 X5 4.8is, but I do really like that Range Rover Sport Supercharged.
I would have to drive both of them right after each other & make my decision then, but since I haven't driven the RR Supercharged, I would pick the 4.8is.
You are right about the Cayenne - speed & drive only, definitely not for looks.....so that rules it out for me. With the 4.8is & RR sc, you have the whole package.........
Good luck on your choice & let us know what you get..............you lucky dog, you.........