I have a Chrysler Grand Voyager, I've had a few of them and they're good for getting people in and out of.
The Mk1, 2 and 3 all have fixed windows in the sliding doors (the Mk4 has electric windows but they can be isolated by the driver).
Dont go for the Voyager, you'll need the extra space in the Grand.
Fuel economy is dire so make sure you get one that is LPG converted. I like them, had a few, change them all the time, easy to fit TV's/DVD's etc into to keep the kids amused.
It is luxury motoring, comfortable over long distances, or go for the Mini-Bus, they work well, I'd look at the Ford Toureno or Renault T35 LWB, not the Mercedes Vito, comfortable but too tight for the child seats.