Can I hi-jack this Mercedes thread please? 
What are the R class like? It's not for now, they're a bit pricey
, I saw one the other day, but if I've seen one before I've never taken enough notice to realise what it was. A heavy 4x4 diseasal 'estate' people carrier looked as though it could be useful with a towbar on the back

I've currently got two 2004 Merc E-Classes, and have been pleased with the quality, so I wouldn't let the quality concern you.
The R-Class hasn't been a massive seller, so that helps and hinders you.
Top spec one's hold their value fairly well, but compared to other Merc models they lose money quickly.
However, Mercs do have an inbuilt need to go to main dealers. For example, both my 04 and 54 plate Mercs don't have dip stick's...you check the oil level by pressing some buttons on the steering wheel in a certain order. Certain common computer's don't connect to them, batterys can go flat very quick.
Had the same issue today, the E220 had a flat battery just after two weeks or so.
So, you could get a 'cheap' one, but it will continue to lose money at a great rate.
It's not something I'd consider myself.
So Mercs are nice vehicles, but just be careful and check things, you may not think to check.