Re: test drove another 545i this weekend.
Get the 545 or a 550, you'll be better off in the long run. The M5 does not have the water cooled alt. or the valley pan leaks. That was a 540 issue, I had one and they failed as did many other things. I have a 545 6spd and like it alot. No failures yet w/ 68k on the clock. "I drive" is a non issue if you can operate a cell phone.