Another think to keep in mind:
In a recent study, the VW Golf TDI came up as the safest car in the "small car" category, the Jetta TDI was third. Dead last was the Chevy Cavalier. I do a lot of driving... about 40k a year. I have been in two major accidents in my life... both times in Mercedes W123 chassis cars. I waled away from both accidents... in another car, it could have been my life. Safety is one of my #1 priorities. Many people are misled into thinking that certain types of cars are safer. It's kind of funny that you have a 1 in 6 chance of being killed in a 35 MPH crash in a Cadillac Escalade. The same crash in a Ford minivan gives you a 1 in 50 chance of being killed. Drive what you want, but do the research on the things that are really important to you.
VWs, like many German cars, can be a bit troublesome... but in general, they do last a long time. American cars tend to go about 100-120k miles, then need some major work, like a new engine or trans. I've got an RV with a GM turbo-diesel engine that's got about 23k miles on it and it already needs a new AC compressor, starter motor, and oil pressure sensor. Oh, and to get to the oil pressure sensor, you have to take the intake manifold off! That thing has needed far more work than my Golf, which has 37k miles on it. As a matter of fact, the only problem I've had with the Golf was one of the seat latches in the back. That was covered under warranty at 35k miles.
That's nothing compared with some of the problems Mercedes has been having recently. My last car was an '83 300D, which I sold with 410k miles on it. It now has about 450k miles on it. Original engine, trans, driveshaft, rear-end, and axles. Talk about a tank! That car also survived one of my big accidents, where I hit a non-moving car at 60 MPH. (No, it wasn't my fault... someone pulled straight out onto the highway illegally in front of me). However, Mercedes aren't built like that any more. They are still very safe, but I don't think you'll see many with 300k+ miles on them in the future.