The best replacement for imovie is final cut pro.

The best alternatives to imovie are rated as following:
★★★★★  final cut pro
★★★★  movie maker
★★★★  imovie hd
★★★★  idvd
★★★  final cut express
★★★  windows movie maker
★★★  final cut
★★  premiere
★  final cut pro x
★  imovie 9.0.9
★  premiere elements
★  gopro studio
★  sony vegas
★  after effects
★  adobe premiere
★  quicktime pro
  screenflow
  final cut x
  magisto
  reeldirector
  adobe premiere elements
  premiere pro
  iphoto
  windows moviemaker
  pinnacle
  iphoto for slideshow
  powerpoint
  splice
  camtasia
  windows live movie maker
  vegas
  sony vegas pro
  pinnacle studio for ipad
  microsoft movie maker
  ilife
  fce

Your alternative for imovie is not listed? Suggest!
Speaking about imovie, one probably shouldn't forget about green screen.

Other search terms related to imovie and their ratings are:
★★★★★ green screen
★★★ gopro
★★★ idvd
★★★ avi
★★★ mp4
★★ isight
★★ avchd
★★ importing
★★ green screen editing
★★ iphone video
★ dazzle
★ ilife
★ avi files
★ quartz extreme
★ garageband
★ slow motion
★ effects
jvc everio
.vob
using idvd
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Google Trends

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imovie
final cut pro
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