Obviously many will disagree with me, but I think that few modern skins can even compare to classic skins when it comes to everyday-usability, for the following reasons:
-Few modern skins, in my opinion, have a design that comes close to the tight, intuitive component layout that Nullsoft perfected with their classic layout.
-Classic skins use a fraction of the resources of modern skins. And after all, winamp is 90% of the time used as a background app - so it has to compete for resources with all the other programs, games, and other background apps that we use from day to day. You wouldn't expect a windowblinds skin that used 10x (or more) resources than a standard wb skin to win "most usable wb skin"......
-With classic skins, there's no need to get used to a new component layout every time you load up a new skin.
So, my votes are (I won't vote for my own or my team's):
1. Bunker (very usable, yet as original and well-crafted as any skin in the competition)
2. Green Pixel Skin
3. Amnex