For those interested in what the great city of Chicago has to offer, read the list below. These are all storefront/showroom locations that actually display the listed speakers.
Audio Consultants - They have four locations. They display the following brands: All Thiel models, all Magnepan, all Martin Logan, all B&W including the Diamond series and they even had the Nautilus snails on a few occasions, Goldmund Epilogue 1 and 2 (used to), Egglestonworks including Andras, good selection of Amphion, good selection of Carnegie Acoustics, all Gallo Acoustics, all Revel (used to), McIntosh (even those made their way through), all Velodyne, all REL, all Phase Technology, Wilson Sashas, and many other brands.
Quintessence Audio - All Vienna Acoustics (including the super expensive models), all Dynaudio including the C2 II Signature, literally all Sonus Faber products, occasional Magico, occasional Vandersteen, REL, Revel, even the obscure line of Sonics, JL Audio, most of the Focal lines including the Utopia models, most of the Avalon speakers, and many other brands.
Simply Stereo - ALL Klipsch speakers, including the entire Heritage line. All Paradigm models including the Signature models. Revel. And many other brands. Very nice guys too
Decibel Audio - Good selection of Epos, good selection of the KEF Q series, good selection of Canton, some Herbeth models, Cambridge Audio, and many, many, many other smaller companies.
Music Direct - Entire product line from Wharfedale, most of the Focal speakers, up to the Electra line, Epos, and many others.
ABT Electronics - Entire Focal product line, including the Utopia line. Krell (used to). Everything from Bang and Olufsen, everything from Bose, most Definitive Technology, most Polk Audio, most MK, most Martin Logan, Sony, Yamaha, and the huge list goes on and on.
Saturday Audio Exchange - PSB line including the Synchrony speakers, Monitor Audio (most of them), Totem, most speakers from NHT, Sonus Faber, Cerwin Vega, KEF (lower end), Sunfire, etc.
Promusica - Tons of Paradigm, tons of Sonus Faber, tons of Epos, all Rega line, REL, Sunfire, Totem, tons of Dynaudio, tons of ProAc, Naim, etc.
Edge Home Theater - Dali, Wilson, Avalon, etc.
Synthesis Audio - some PSB Synvhrony, Revel Ultima2 towers and all Performa2 speakers, all Jamo speakers, all Mission speakers (including their reference towers), Atlantic Technology, JBL, Klipsch, Niles, Velodyne, and tons of other brands.
Best Buy Magnolia - Most of the Klipsch line, lower end Martin Logans, most of the Definitive Technology speakers, Vienna Acoustics, Sonus Faber, all of the Energy speakers, JBL, and tons of other brands.
These are just a few of the stores that I've visited. Chicagoland has the above times 5 (at least). Too many smaller stores to list.