The best replacement for forza horizon is forza 4.

The best alternatives to forza horizon are rated as following:
★★★★★  forza 4
★★★  need for speed
★★★  need for speed rivals
★★  grid 2
★★  need for speed most wanted
★★  forza 5
★★  gran turismo 5
★  forza 3
★  motorsport 4
★  gran turismo 6
★  most wanted
★  forza 4 graphics
★  forza motorsport 4
★  nfs rivals
★  tdu2
  forza horizon limited edition
  nfs most wanted
  forza motorsports 4
  nfs mw
  gt5

Your alternative for forza horizon is not listed? Suggest!
Speaking about forza horizon, one probably shouldn't forget about smartglass.

Other search terms related to forza horizon and their ratings are:
★★★★★ smartglass
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Google Trends

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forza horizon
forza 4
need for speed