Focus on the basic sound and presentation. Anomalies like the one you mentioned of blurred lower bass can be caused by many things including room, cable, electronics etc. and there are just as many cures for this type of problem. Listening to equipment in a stereo store means very little and if you insert a single piece of equipment into your system without making adjustments it is also a waste of time. Find something (speakers/electronics) and spend some time with it to learn what it has to offer.
