I have trouble believing that dealers won't let you take home high end equipment to audition in your system. If it is in the shop it is demonstration equipment anyway. They take your credit card information and only charge to it if you don't return it. Many dealers do this. The ones that don't should be avoided. One cannot make an educated evaluation without it being in their own home system. Especially at the very high prices this stuff cost. Worst case scenario, listening to it in the store, buying it on that alone, taking it home, and it sounds not very good. you are then stuck. Would you buy a car sight unseen and without a test drive? I can understand this if the dealer is several hundreds of miles away. But, maybe a quick conversation with the manufacturers can help in obtaining demonstration pieces to audition.
enjoy