Hi Ericchang,
I second Doug's recommendation on checking out Audio Consultant. I have yet to visit ProMusica and Holm, but I would recommend Avant Garde Audio on Clark St. and Quintessence Audio, which is the authorized Wadia shop. Another shop that might be of interest is Celestial Sound in Evanston; they carry Accuphase, Plinius, Metronome...etc.
Hope this helps!