The only gripe is that with the kids car seats installed in the rear, the middle seat is unusable.
I want nothing to do with the likes of an Espace, Picasso, Zafira or Galaxy.
Seems a 2011/2012, ~80k miles, R350 CDI long wheel base is within budget. From what I have seen it has 6/7 full size seats, huge rear legroom, and high levels of refinement and spec. Beyond that I know very little about them.
You will really struggle to find a car, or SUV for that matter, where your middle seat is usable by an adult, with 2 kids seats flanking them. Trust me, I have tried.
Over and above that, if you need to use the rear seats also, you can only access them from the boot if you have kids seats in the outer two seats on the middle bench. As such, if you want to use these seats, you need one of the kids seats in the middle to allow access to the rear. So you really want to be looking for 3 ISOFIX seats on the middle row of a 7 seater.
Looking at the R-Class (I looked myself before), you simply wont get a usable middle seat. Of course, you can look at a 6 seater one, like the AMG shown above, but you will need one of the kids in the back. If you want any extra people coming with you.
Even many of the big SUV's don't have reasonable middle seat room with kids seats (X5's are a no, they are about the smallest "big" SUV going). What you really need to do is find something where the middle seat is also an ISOFIX seat. Only then will you find something with a wide enough rear bench to have a usable middle seat. The Disco 3/4 manages. Range Rovers (FF not Sport) have enough space, although I can't remember if their middle seat is actually ISOFIX.
You may find an early / higher mile Disco 4 XS in budget (probably the way to go with your requirements). Since you have already binned the likes of the Galaxy or Sharan, which are ideal for your needs, and vans like the Merc V-Class or VW Transporter, you really have narrowed the market significantly enough that you will struggle to find what you want.
I have heard reports that the Skoda Superb has enough rear bench width, but I haven't tried it myself. The new Kodiaq may have the room, but I haven't gone to see one in the flesh yet, so can't confirm.
[TW]Fox;30427185 said:
The answer to every motoring question is a 5 series. I therefore recommend you buy 2 5 series instead of 1 R class.
Yep. 2 5 series is the way to go. One for kids, and the other for adults. Then draw straws for who drives the kids car.
My 5 series was decent as a kid moving motor. But almost useless if I wanted to take another adult beyond myself and my wife. But it's not a patch on the practicality on my Alhambra, which is why the 5 series went and the Alhambra stayed. I get that most people don't understand that swap, but when practicality trumps pretty much everything else, you have little option but to do what works best. And I have zero regrets on my side. The usefulness we have had out of the Alhambra has easily made it worth it.
Good luck with the search. You are basically not going to get what you wanted, because you have put too many conditions on what you will go for. But I wish you luck in finding a compromise you can live with. You are probably better off sticking with what you've got though, as there will be little out there that will do much better.