In order of the longest I've had to shortest: E92 M3, E36 M3, Z4M Roadster, Tundra Platinum:
I like them all, not sure which direction to go next.
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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