The best replacement for diet pepsi is pepsi max.

The best alternatives to diet pepsi are rated as following:
★★★★★  pepsi max
★★★★★  diet coke
★★★  regular pepsi
★★★  pepsi
★★  pepsi one
★  coke zero
★  coke
★  diet pepsi max
★  pepsi next
★  pepsi zero
  diet pepsi 0
  mentos

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Speaking about diet pepsi, one probably shouldn't forget about mentos.

Other search terms related to diet pepsi and their ratings are:
★★★★★ mentos
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Google Trends

Scale is based on the average worldwide traffic of diet pepsi in all years. Click on graph for more.
diet pepsi
pepsi max
diet coke