The best replacement for rs6 is m5.

The best alternatives to rs6 are rated as following:
★★★★★  m5
★★★★  rs4
★★★★  e55
★★★  s6
★★  e63
★★  bmw m5
★  r8
★  rs7
★  rs5
★  rs 7
★  e63 amg s
★  rs8
★  rx6
  s8
  mercedes e55
  c63
  b5 rs4
  b&w cm7
  e60 m5
  b&w 683
  e55 amg
  infinity c336

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Google Trends

Scale is based on the average worldwide traffic of rs6 in all years. Click on graph for more.
rs6
m5
rs4