Actually, I prefer for the person you are trying to impress to pick something from your library. With a few exceptions for a horrible recording here or there, it pretty much always initiates a wow factor. If they don't pick something out, then I usually go with the music genre that they like best. I always have my own personal favorite recordings that show off a system. Of course better recorded 24/192 & 24/96 files tend to be better too.