The best replacement for m3 is m5.

The best alternatives to m3 are rated as following:
★★★★★  m5
★★★★  s4
★★★  335i
★★★  c63
★★★  911
★★  m6
★★  corvette
★★  sti
★★  r4
★★  s5
★  m4
★  rs4
★  isf
★  gtr
★  mustang
★  rs5
★  audi s4
★  335
★  prius
  evo
  porsche 911
  z06
  s2000
  c63 amg
  350z
  cayman s
  cayman
  mustang gt
  g35
  r4ds
  is-f
  supercard
  1m
  r4 ds
  cts-v
  boxster
  e46 m3
  c32
  r32
  amg

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Google Trends

Scale is based on the average worldwide traffic of m3 in all years. Click on graph for more.
m3
m5
s4