The best replacement for 550i is m5.

The best alternatives to 550i are rated as following:
★★★★★  m5
★★★★★  535i
★★★  335i
★★★  e550
★★★  s6
★★★  545i
★★  650i
★★  750i
★★  e39 m5
★  m45
★  528i
★  550xi
★  m56
★  cls550
  m5 e60
  535d
  mercedes e500
  mercedes e550
  650i gran coupe
  530i
  bmw 545i
  550i gt
  e500

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Google Trends

Scale is based on the average worldwide traffic of 550i in all years. Click on graph for more.
550i
m5
535i