The best replacement for 256 is 320.

The best alternatives to 256 are rated as following:
★★★★★  320
★★★★  512
★★★  512 ssd
★★  128 ssd
★★  320 kbps
★★  128
★★  128 macbook air
★★  320 mp3
★  384 bit
★  128 bit video card
★  512 macbook pro retina
★  128 gb macbook air
★  192 kbps
★  256 vbr
★  24 bit color
★  lossless
★  512 raspberry pi
★  128 bit encryption
  192
  512 macbook air
  257
  320 bitrate
  255
  6600gt 128
  192 bit
  128 encryption
  miller 252
  aes 128
  3des
  mp3 320
  512 retina
  128 video card
  8800gt 512
  320 aac
  blowfish
  64 qam

Your alternative for 256 is not listed? Suggest!
Speaking about 256, one probably shouldn't forget about 512.

Other search terms related to 256 and their ratings are:
★★★★★ 512
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Google Trends

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256
320
512