I had 2007 high roof CRD. I did 60k miles running interstate delivery in less than a year. It's hard to believe but spring 2008, after one winter there was rust spots showing on every side of the van.
I was lucky (mechanically) I only had center shaft bearing failure. Easy fix but try dealing with people at Dodge! Worst service ever, and they wanted me to pay few hundred bucks for the bearing and labor with vehicle being under warranty.

2007 and up have DPF, also new aluminium 3.0L V6 (very strong and quiet)

2006 is the last year without DPF, (less BS) they also have 5 cyl 2.7 liter engine that gets better mileage but only with 3.72 gears. Avoid 4.10 as they're running 3000+ rpm highway and economy is history.

I would buy it again but only in Europe with 6sp manual. Dodge is definately not a Mercedes

great site here
http://www.sprinter-source.com/