The best replacement for strikeforce is ufc.

The best alternatives to strikeforce are rated as following:
★★★★★  ufc
★★  wonderholme
★★  bellator
★★  nightforge
★★  wec
★  wonderholme tera
★  conjunct
★  steadfast
★  ufc ratings
★  nightforge pve
  warriors orochi
  ufc better
  dynasty warriors 6
  tapco intrafuse
  light my fire

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Speaking about strikeforce, one probably shouldn't forget about fedor.

Other search terms related to strikeforce and their ratings are:
★★★★★ fedor
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strikeforce
ufc
wonderholme