The best replacement for 650i is m6.

The best alternatives to 650i are rated as following:
★★★★★  m6
★★★  750i
★★  550i
★★  sl550
★★  645i
★★  650ci
★★  p35
★★  645ci
★★  640i
★★  s7
★  p965
★  cls550
★  965
★  cl550
★  680i
★  brute force 650
  635d
  e550
  jaguar xk
  audi rs5
  audi s5
  cls 550
  xk
  sl500
  intel p35
  mercedes 550sl

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Google Trends

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650i
m6
750i