The best replacement for e4200 is ea4500.

The best alternatives to e4200 are rated as following:
★★★★★  ea4500
★★★★  e4200v2
★★★★  e3200
★★★★  n66u
★★★★  airport extreme
★★★  ea6900
★★★  e3000
★★  ea3500
★★  wndr3700
★★  apple airport extreme
★★  rt-n16
★★  rt-n66u
★★  wndr4500
★★  n900
★★  e2500
★  ea6500
★  wndr4000
★  e4300
★  netgear n900
★  e4500
★  wrt610n
★  netgear n600
  asus rt n56u
  rt-n56u
  dell e4300
  netgear n750

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Speaking about e4200, one probably shouldn't forget about re1000.

Other search terms related to e4200 and their ratings are:
★★★★★ re1000
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e4200
ea4500
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