The best replacement for a640 is a630.

The best alternatives to a640 are rated as following:
★★★★★  a630
★★★★  g7
★★★★  a710
★★  a620
★★  a710is
★  sd800
★  canon g7
★  canon s3is
★  a650
  canon a630
  a710 is

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a640
a630
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