Although there are so many media players out there, saying this one or that one is the best is like saying my beach front property is better than your's.
anyways, although the univeral media player is media player...i use winamp FTW, i think it has the coolest visuals of any media player out there. I can back that up the the all time coolest one : Milkdrop.
on the second hand i use itunes for music transfer from my pc to my ipod. but for listening to mp3 cd's...it's winamp all the way.