The best replacement for 550 is 650.

The best alternatives to 550 are rated as following:
★★★★★  650
★★★  575
★★  540 motor
★★  650 dillon
★★  700 grizzly
★★  560 levis
★★  560
★  535
★  559
★  660
★  880
★  650 paracord
★  460
★  580
★  remington 700
★  600 trex
★  850
  zumo 660
  hornady lock n load
  m5
  grizzly 700
  gtx 460
  520
  sportsman 550
  540
  551
  570 polaris
  550t
  550b
  470
  roomba 560
  io 520
  564
  remington 798

Your alternative for 550 is not listed? Suggest!
Speaking about 550, one probably shouldn't forget about lee dies.

Other search terms related to 550 and their ratings are:
★★★★★ lee dies
★★★★ rcbs dies
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Google Trends

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550
650
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