Let them choose! If you go to dealer to hear some equip do you want dealer to play some music you never heard before, no you bring music or have them play music you know so you have a point of reference for how good it sounds. Trelja no need to worry about big bass, guests will hear so many new details and spatial resolution they never knew existed from a CD they heard a 100 times, usually they will refuse to believe that it is the same CD that they have till you let them exmine it closely
Which track do you demo to your friends?
You know when a friend arrives at your house, sees your stereo and says "how much did all this cost". You tell him/her the $$$ and they say "are you mad?" Of course, the next step is to justify it by playing something that will make their jaw hit the floor. Which track do you play? Me, I play a track called "Spanish Harlem" by Rebecca Pidgeon off an album called "The Raven". Works every time :-) Their jaw hits the floor, and no-one speaks till the song is over. Then they something along the lines of "Oh, I see what you mean". Follow up/alternate demo tracks for me would include "Fire and Roses" by Mimi Goese and "Ordinary Life" by Christen Barry. What track do you play in this most demanding of moments?