The best replacement for xp400 is xp500.

The best alternatives to xp400 are rated as following:
★★★★★  xp500
★★★★★  x42
★★★★  xp510
★★★★  px5
★★★  a40
★★★  px4
★★  a50
★★  xray
★★  nx430
★★  xp300
★  xp 410
★  astro a50
★  xp 600
★  xp600
  xp500 better
  px51
  xp 300
  xp410

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xp400
xp500
x42