The best replacement for px51 is px5.

The best alternatives to px51 are rated as following:
★★★★★  px5
★★★★★  px4
★★★★  a50
★★★★  px 510
★★★  a40
★★★  astro a40
★★★  xp seven
★★★  xp500
★★  xp400
★  xp510
★  astro a50

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px51
px5
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