Volkswagen Touareg. The 2012 and 2013 are looking good so far in our reliability stats. Unfortunately we don't have much data on earlier model years. They are harder to find than the BMW and Mercedes, and they aren't much less expensive. Possibly the best ride/handling balance of the three.
The BMW and Mercedes are more complex, so they have more things to go wrong. The 2012 redesign greatly improved the Mercedes, but the first model year looks like it might be glitchy. I imagine a 2013 is over your budget.
With any German cars newer tends to be much better with regard to reliability.