The best replacement for class 4 is class 6 sdhc.

The best alternatives to class 4 are rated as following:
★★★★★  class 6 sdhc
★★★★★  class 6
★★★★  class 10
★★★  class 6 memory card
★★★  class 10 memory card
★★  class 6 sd card
★★  10 sd card
★★  class 10 sdhc
★  class 10 micro sd
★  class 10 sd card
★  class 6 microsd
★  10 memory card
★  class 3 hitch
★  class 10 sd
★  class 2
★  class 2 sd card
★  6 sd card
★  class 2 micro sd
  6 sdhc
  10 micro sd
  class 6 sd
  class 2 sd
  class 2 nic
  class 2 sdhc
  class 6 memory cards
  6 micro sd
  class 10 microsd
  class 2 microsd
  class 10 micro sd card
  class 6 card
  class 10 memory
  class 6 micro sd

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class 4
class 6 sdhc
class 6