The best replacement for 727 is 737.

The best alternatives to 727 are rated as following:
★★★★★  737
★★★  518
★★★  904
★★★  md80
★★★  757
★★★  th400
★★  trident
★★  dc 9
★★  a518
★★  904 transmission
★  46re
★  707
★  turbo 400
★  dc10
  717
  725
  724
  boeing 737

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Speaking about 727, one probably shouldn't forget about gear vendors for sale.

Other search terms related to 727 and their ratings are:
★★★★★ gear vendors for sale
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727
737
518