The best replacement for 550t is montana 650t.

The best alternatives to 550t are rated as following:
★★★★★  montana 650t
★★★★★  450t
★★★★★  62st
★★  650t
★★  60csx
★★  gpsmap 62st
★  garmin gps map 62st
★  explorist 610
★  explorist 710
★  oregon 450t
★  magellan explorist 710
  dakota 20
  62stc
  550
  magellan explorist 610

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550t
montana 650t
450t