Should be an interesting thread. I'm in.
Only got mine a few months ago.
1. Looks: $0. Content with the sleeper E90 stock look.
2. Performance-ish: $2750. Planning to SC in the near future.
3. Wife: She don't ask & I doesn't tell. As long as bills (/her shopping CC) get paid on time. However, she is staking claim to my early Tesla Model 3 reservation.
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Current: 08 E90 M3 DCT SSII w/ BE RB Swap, H8 Lux 180s, MS Drop-in AF, CF spoiler, CF diffuser, OEM CF leather trim, CF DCT paddles, Custom DCT flatbottom wheel, MirrorTap 9500ix, RockAuto rotors, Hawk HPS pads, AMS ECU 93 Oct Map Tune, GTS DCT update, Slambo custom undertray