The best replacement for 800mhz is 667mhz.

The best alternatives to 800mhz are rated as following:
★★★★★  667mhz
★★★★★  1ghz
★★★★★  1900mhz
★★★★  vhf
★★★  667mhz memory
★★★  1066mhz
★★  1ghz processor
★★  1333mhz
★  4gb 667mhz
★  700mhz
★  533mhz
★  1900 mhz
★  3gb 667mhz
★  600 mhz
★  700 mhz
★  4gb 1066mhz
  667
  ddr2 1066mhz
  667mhz ram
  6gb 667mhz

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Speaking about 800mhz, one probably shouldn't forget about 667mhz.

Other search terms related to 800mhz and their ratings are:
★★★★★ 667mhz
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800mhz
667mhz
1ghz