The best replacement for external flash is built in.

The best alternatives to external flash are rated as following:
★★★★★  built in
★★★  speedlight
★★★  built in flash
★★  new lens
★★  pop up
★  pop up flash
★  build in flash
★  speed light
  ring flash

Your alternative for external flash is not listed? Suggest!
Speaking about external flash, one probably shouldn't forget about x100s.

Other search terms related to external flash and their ratings are:
★★★★★ x100s
★★★★ d3100
★★★★ t2i
★ nikon d40
★ canon 40d
★ nikon d3000
You have in mind a companion for external flash and it is not yet here? Propose!



Google Trends

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external flash
built in
speedlight