MPlayer is owned by MPC? I've used both and MPlayer is a different program, so thats a surprise. I use the
MPUI front-end for MPlayer.
Yes, QCD doesn't have the best play list support, but not everyone has the need to organize 10,000 songs. They're next version will include a full media library however. If I needed an iTunes alternative, I would definitely use
Songbird.
I agree that the AIM 6.0 version of Ad-Hack is bloated, thats why I use the "classic" 5.9 version. No ads/spyware and very lightweight!