It wasn't a good set up that picked up watch noise, it was a good monitor system that made it audible... Take your watch hand and put it near an electric guitar pickup that's plugged in and you'll certainly hear it if it's quiet enough...
520 CDs? You don't like much music, do you?
I've got about 3700 songs on my Zune, basically all rock. I think I have around 50 CDs, once again all rock.