The best replacement for a90 is a100.

The best alternatives to a90 are rated as following:
★★★★★  a100
★★★  a100 micromax
★★★  a18
★★  a100 which is better
★  a90s
★  a87
★  karbonn a18
★  karbonn a24
★  mini 9
  dell mini 9

Your alternative for a90 is not listed? Suggest!
Speaking about a90, one probably shouldn't forget about a100.

Other search terms related to a90 and their ratings are:
★★★★★ a100
★ a90s
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a90
a100
a100 micromax