The best replacement for ss501 is super junior.

The best alternatives to ss501 are rated as following:
★★★★★  super junior
★★★★★  dbsk
★★★  tvxq
★★  2pm
★  shinee
★  bigbang
★  suju
★  ft island
★  arashi
★  a'st1
  mblaq
  u kiss

Your alternative for ss501 is not listed? Suggest!
Speaking about ss501, one probably shouldn't forget about kara.

Other search terms related to ss501 and their ratings are:
★★★★★ kara
★★★★★ snsd
★ love like this
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Google Trends

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ss501
super junior
dbsk