What do you LIKE BEST about your current audio system?

From the bottom up...
Hard driving deep tuneful bass
Layers of inner detail,clear with rich timbre
Expansive sound stage, highs not bright yet completely expressive. 
The way it looks and feels and the emotional reaction I have when listening to some damn good music.

The way it makes my Patricia Barber, Diana Krall and that song about Keith not going sound...

I am a headphone guy first and home theater guy second. 
The love i have for my headphone rig is out of this world, although it is a sensitive beast requiring top notch recordings. 
I use the sennheiser hd 800 c's, cyrus cd i with its own intelligent power supply (PSXR-2), Chord qutest DAC and a burson soloist amp. The headphone rig is complete with great interconnects, power cords and a powerline conditioner. The PRAT ( pace rythem attack timing) and dynamics displayed is really something. I love my headphone rig. Best i have ever heard and it is all mine!! :) 

Too bad it doesn't always sound like I posted above but I working on it.... 
Some body real please tell me about power conditioning , I am an un believer.

"...and that song about Keith not going."

Not sure if that was rhetorical or not, but I think you're referring to the Nils Lofgren song "Keith Don't Go".