have tried winamp, sonique, mediaplayer, realplayer, creative's sb player (dont know what its called), and pcdj...
personally i have to give it to pcdj as it allows more than just simply playing the song, ie. mixing, bpm matching, fading, etc. (although u have to pay for the professional versions, but i think they have a free player on their site...not sure though)but otherwise, winamp is the only other player id consider.... winamp3 should be good