The X5 is my daily driver.
For joyriding I have a E28 528i (Which is getting S38B36 from E34 M5 this year) and a E12 525 (which is getting a M106 3,4 Turbo from a E23 745i very very soon.)
I've used both the E28 and the E12 as daily drivers, and bought the X5 to have a "sensible" daily driver. Diesel is "sensible" because it's a lot cheaper than gasoline, so I got the X5 diesel.

I've also had a E34 525tds and a E30 320i as daily drivers. Using old cars as daily drivers require more mainetenance than I had time and energy for. They're easy to work on, but there was always something that needed to be done. And I always had to have two cars registered, just in case one broke down, I could use the other one while I fixed the broken one.

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2004 BMW X5 3.0d
Safirschwarz metallic / Black Dakota leather