Well i use Mpc that comes with k-lite but since Flaser, Tegumi and DjDott use Foobar, I'm going to give it a try cause chances are it's going to be better :P
WMP and VLC most of the time I don't even notice which since I mostly just look at the title and double click it.
And mostly I use I-pod and I- phone to listen to music and just play the music on the pc to check if I the music I have is good or whether or not I have the right one.