money aside, I feel like the only 2 options I look for in the C63 would be P31 or LSD. Track performance-wise, non-P31 C63s are on par with DCT M3s, so it wouldn't be a significant performance upgrade to go to a C63.
At the end of the day, it's all about what car you enjoy driving the most. If I were in your situation, I would not take the depreciation hit on the M3 for this C63 without the P31.
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