The best replacement for wmp is itunes.

The best alternatives to wmp are rated as following:
★★★★★  itunes
★★★★  winamp
★★★  vlc
★  mediamonkey
★  quicktime
★  foobar
  real player
  musicmatch
  wmc
  foobar2000
  flip4mac
  eac
  lame

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

Other search terms related to wmp and their ratings are:
★★★★★ zune
You have in mind a companion for wmp and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of wmp in all years. Click on graph for more.
wmp
itunes
winamp