On the technical side, I just finished putting together a complete system (vinyl, streaming, cds) and I'd have to say my favorite thing about my new system is the sense of timing it brings to the music. Specifically, my Focal 1028be speakers are the first speakers I've ever heard where I can hear what other audiophiles called timing and I could never figure out what they were talking about. Now I get it!
Emotionally, My favorite part of my system is my Audio Sensibilities Signature Speaker cables. They are the size of a baby's leg and sound great and make me smile at their absurdity each time I look at them. I'm in love.