OK, time to raise a little hell and play devils advocate...
Why did you choose a 5 series? what makes it better than a GS430, an E Class, or hell.. an S2000 and a winter beater?
The 5er seems to be the jack of all trades but master of none.
It is not a great winter car, its rear wheel drive.
It is not the fastest car on the road, you'd get stomped by a much cheaper dodge SRT-4
It is not the most luxerious, see M.Benz.
It's too small to be a hauler/touring car, see 7er and S-Class.
Its too big to be a decent auto-x'er, see 3 series.
So what is so good about these things?