audacious - audio player for me

Q: What is the most usable cross-platform audio player for me?
A: I've found Audacious (http://audacious-media-player.org/).

I've been searching for a usable audio player for quite some time.
I intentionally won't say best one, but rather usable one, as my player of choice during the years keeps changing :)

My (current) requirements

Might be quite user specific, but still, here they are:

• runs on linux (windows would be a plus, however since my recent job change, I don't need windows neither at home nor at work)
• free, or better open source licensed (rather my decision, than a need)
• integrates lyrics into the UI
• can be minimized to system tray (by closing it)
• playback can be controlled by the keyboard (when in the player UI), as I hate those, that can be controlled by mouse only (I consider mouse beeing much slower input device for the specific actions that keyboard)
• shouldn't eat all my resources just to play music in the background

Well, as far as I remember during these years of my music listening experience I've been using following (more less chronologically)

winamp (http://www.winamp.com/)

• was quite some time ago, in my "windows ages"
• I still like it's original look and consider it's UI designers unbeated (with respect to idea and it's realization)
• major blocker was for me however no linux port

xmms (http://www.xmms.org/)

• worked well for me on linux
• supported winamp skins => more less same look
• not available any more in the most linux distros these days
• in the time I've been using it I needed windows port as well, there was no such, but winamp did the job there

songbird (http://www.getsongbird.com/)

• I liked the UI integration of all the song related stuff, but finally I've found myself using only lyrics in my daily life
• this was the first one, when I started to be OK with no winamp-like look (so it was very valueable for me for my future choices)
• there were quite some problems with linux port, these made me believe there has to be an alternative:
• first: no official packages in major linux distros 
• then: officially announced discontinued support for linux  
• nightingale (it's linux port http://getnightingale.com/) - had no stable/usable release for quite some time 
• in the meantime I changed already
• moreover was quite resource consuming

amarok (http://amarok.kde.org/)

• worked well for me on linux
• I even wrote a small plugin for it: http://kde-apps.org/content/show.php?content=137205
• had nice lyrics integration 
• ubuntu notifications worked/looked well
• however I've come to conclusion that there should be some more lightweight/performant player available (for the simple needs I have)

clementine (http://www.clementine-player.org/)

• worked well for me on both platforms
• as I've been used to amarok this was to me only a more performant version (as they forked old amarok version)

audacious (http://audacious-media-player.org/)

• works well for me these days
• fulfills all my requirements I mentioned in the prio section
• the greatest advantage to clementine I see is the lower CPU usage

Now the question is: What is your audio player of choice?