The two biggest variables you will encounter relate to software and room effects. These are even more significant if you are purchasing full range speakers. You can minimize the software variable by taking your own CDs/LPs, but you probably can not duplicate your room. Some dealers have very good rooms and others have horrible setups. Once you have shortened your list via in-store auditioning you will need an in home audition. Taking the piece(s) home over the weekend while the store is closed is best for the dealer as he/she can not sell if the demo unit is not in store. I do not think trying to do comparisons between similar prospective components at home the first weekend is wise. You may not have enough time to carefully absorb the differences. Be sure and get the unit(s) warmed up too. Take one piece home one weekend and the other the next. Take notes. Maybe do a "shoot out" on the third weekend?
In-store listening is to narrow your list to what you want to listen to at home at best.
In-store listening is to narrow your list to what you want to listen to at home at best.