The current 2 series platform and F87 are coming up on end of production and replacement. Paying a huge premium for a CS will be a mistake unless around $20k is a rounding error for you.
Based on the M3/M4 CS, it's probable that there will be minimal performance increase.
If you don't care about value or cost, then get the CS. If you want a good car now, just buy the M2C.
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