Going to be getting a 4x4 due to needing one for a month or 2 to be honest, the choice boils down to these, which to choose? It'll be newer than a 2005 model too as most faults on these cars have been ironed out by then.
Range Rover
Range Rover Sport
Volvo XC90
Land Rover Discovery
Porsche Cayenne
Nissan Pathfinder
Nissan Navara
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Which would you choose, has to be one of the above due to comfort and it has to be quick-ish. Quite interested in a 2007 '07' Land Rover Disco 4.4 V8 which I'll be viewing at some point this week.
If you have experience with any let me know 
X5 - Avoid, Hampshire police have had many issues with their lot, a tendancy for some part of the air conditioning system to cause the vehicle to catch fire.
Range Rover - Good vehicle, I had a 2005 '55' TD6 Vogue, not amazingly quick, but good enough...I'd have another any time. Check operation of air suspension, low battery status can cause fault message to appear.
RR Sport - Hate then with a passion

may be a good car, but I just don't like them
XC90 - Ianu on the forum ghas one, he'd be the best guy to talk to about one.
Jeep Grand Cherokee - My father has an '06' 5.7 Hemi, he loves it...I've driven it and it goes really well, corners well enough. But trim finish isn't great, no where near that of a Range Rover.
No idea on Cayenne, drove one for a very short distance. Likewise with Disco, driven one very short distance, but seems a capable vehicle.