Like previously mentioned, if you're gonna buy used, get the latest and greatest of that generation. I would avoid 06-7. Look for an 08-10. Those are the LCI cars that got the revised interior, lights, SMG, and updated software.

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08 M5 Sepang/Portland - Modified
06 Mini Cooper JCW GP 1281 - Modified
10 Mini Cooper S Laurel Sport - Modified
99 MCoupe Arctic Silver---> Laguna Seca Blue - Sold
01 740i Sport Titanium Silver- Sold
04 X5 4.8is Estoril - Sold
98 M3/2 - His - Sold
97 M3/4 - Hers - Sold