The best replacement for 2.5 is 3.5 hard drive.

The best alternatives to 2.5 are rated as following:
★★★★★  3.5 hard drive
★★★★  3 exhaust
★★★★  3 inch exhaust
★★★  3.5
★★  3.5 ssd
★  msata
★  3.5 hdd
★  4.0 wrangler
★  3.5 sata
★  3.6 outback
★  2.6 ghz
★  3.5 external hard drive
★  2.9 ghz
★  5 benzoyl peroxide
★  3.5 hard drives
★  1.8t
★  3.5 mm jack
★  cl 3
★  3.5 hard drive enclosure
  10 benzoyl peroxide
  3.6
  3.5 headphone jack
  3.5 drives
  2.0 subaru
  cas 3
  3 downpipe
  3.5 altima
  3.3
  2.25 exhaust
  2.6
  3.5 ide
  pm 10
  3 down pipe
  3.6 subaru outback
  3.5 sas
  2.5s
  2.7
  1%
  3.5 external drive

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Speaking about 2.5, one probably shouldn't forget about virtuemart.

Other search terms related to 2.5 and their ratings are:
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2.5
3.5 hard drive
3 exhaust