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Edit: And there is more to choosing a car based on its mechanical condition. There are options you might consider important such as [depending where you are and what's available]:
- engine size - 1.9 four cylinder, or the 6 cylinder models 2.0, 2.2, 2.5, 2.8, 3.0 and 3.2///M
- Color of interior and or exterior
- Year of manufacture can determine facelift models
- Roll hoops
- Sports heated seats
- lowered or standard suspension
- Auto to manual trans
- Number of keys supplied
- Hardtop
When I was looking for mine I wanted an auto, 2.8 or higher, 2001 or 2002 model, sports heated seats, roll hoops and the rest was optional. Ended up with a 2001 3.0 Oxford Green 2 exterior, beige interior with several factory options, favourite wheels and lowered suspension, all the keys, well maintained by BMW, and so forth.
Cheers.