The best replacement for 8 speed is 9 speed.

The best alternatives to 8 speed are rated as following:
★★★★★  9 speed
★★★★★  10 speed
★★★  5 speed
★★★  6 speed
★  windows 7
★  9 speed cassette
★  9 speed chain
  9 speed cassettes

Your alternative for 8 speed is not listed? Suggest!
Speaking about 8 speed, one probably shouldn't forget about hemi.

Other search terms related to 8 speed and their ratings are:
★★★★★ hemi
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8 speed
9 speed
10 speed