The best replacement for 450r is banshee.

The best alternatives to 450r are rated as following:
★★★★★  banshee
★★★★  raptor
★★★  450x
★★★  400ex
★★★  250r
★★★  yfz450
★★  700xx
★★  450er
★★  raptor 660
★  yfz 450
★  yfz
★  predator 500
★  700r
★  raptor 700
★  predator
★  ltr
★  700 raptor
★  yamaha yfz 450
  yfz450r
  ltz400
  ltr 450
  660r
  yamaha 450r
  yamaha yfz450
  ltr450
  z400
  yamaha 450
  ltz 400
  trx 450r
  raptor 700r
  yamaha yzf 450
  crf450x
  crf 450x

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Speaking about 450r, one probably shouldn't forget about full flight a-arms.

Other search terms related to 450r and their ratings are:
★★★★★ full flight a-arms
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450r
banshee
raptor