Strange - Please tell me you didn't get the 4-cyl diesel option! I knew this really wealthy Indian guy once, when I had a e36 325is, and I told him I was going to get a 5-series. He gave me this big speech about how 3-series are entry level cars when you're on the way up, and 7-series are when you have made it, so never get a 5-series because it just says you are nowhere.
For some reason I believed him for a long time, he had a convincing way of speaking. It's a stupid philosophy really. Especially the models in the late 2000s totally changed my mind though. There's been a few great "middle child" euro sedans. The flagships are often so overdone with useless electronics and weight anyway, it's just to say you could afford it. I'd get a 3 or 5 if I was getting a BMW. I hear the 4 series is the best one now though, I don't know, I don't keep up with them anymore.