For the Mercedes I like the S600. What do you think about the Mercedes SUV. I am thinking about having to carry passengers too.
Well you have the ML and the GL Mercedes SUV's. ML is nice, yet is only a 5 seater, and a full load of passengers would be a tight squeeze. The GL is much bigger and a seven seater, and is one of the few suv's where the back two seats actually can fit adults, where most can only fit kids. The GL is more pricey though...
The S600 is really roomy in the back seat. My grandfather owns one, and the back seats have full electrical adjustments (recline and shit) and have full heating and cooling seats, along with massaging seats. You could throw a party in the back

I dont know what model you would be looking at, but here in Aus you would still have to pay around 200k or so for a low mileage '06 model S600.