Like I said, if I could justify another V8, I'd pick up an Imola Red E39 M5 in a heartbeat. Gorgeous. But again OP, I work on my cars. If you don't, then I don't recommend an older M.
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Current:
16 F82 M4 GTS, Black Sapphire/Black, DCT
08 E92 M3, Sparkling Graphite/Bamboo Beige, 6MT
07 E85 Z4M Roadster, Alpine White/Red, 6MT
99 E36 M3, Techno Violet/Dove Grey, 6MT