The best replacement for p 51 is me 109.

The best alternatives to p 51 are rated as following:
★★★★★  me 109
★★★★★  me 262
★★★★  bf 109
★★★  fw 190
★★★  p 38
★★  f4u
★★  f4u corsair
★  messerschmitt
★  p 47
★  109
  yak 9
  p 40
  focke wulf

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Speaking about p 51, one probably shouldn't forget about f 22.

Other search terms related to p 51 and their ratings are:
★★★★★ f 22
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p 51
me 109
me 262