The best replacement for g450 is g550.

The best alternatives to g450 are rated as following:
★★★★★  g550
★★★★  global 5000
★★★★  falcon 900
★★★  challenger 605
★★★  900ex
★★  legacy 650
★★  g430
★  g650
★  cl605
  g470

Your alternative for g450 is not listed? Suggest!
Speaking about g450, one probably shouldn't forget about s8300.

Other search terms related to g450 and their ratings are:
★★★★★ s8300
You have in mind a companion for g450 and it is not yet here? Propose!



Google Trends

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g450
g550
global 5000