New to seperates...need suggestions

Will be using the denon as a pre for the immediate future with plan to go to all seperates eventually. Have considered the acurus line and read reviews but very little info on the sound of these amps compared to the ones I mention. Presently the system seems to blur a bit, limited soundstage (just between the speakers and no front to back), and looses all dynamics at lower volume. Would like to be able to play at lower volume and still have feel and dynamics like being in a club with a live band that isnt trying to blow you out.
thanks for the suggestion and any more info will be appreciated.
Steve

Plan is to eventually upgrade both to a primary music system that also does ht. It is however a step at a time process for me. I also felt that speakers would be the best first step and tried a set of B&W 805 Nautilus biwired in my system. The differences between them and my polk's was slight to say the least and to be honest the times my wife and I said "wow, now theres the difference we're looking for" it was our current polk bookshelfs that we were listening to. Know that the b&w is a well respected speaker and felt that there had to be a reason for this. A discussion with my dealer had him suggestion that the denon just wasn't enough amp to get the best out of the b&w. He felt that an amp added to the system might be the biggest addition at this time. Maybe the b&w just aren't able to give what I want but if an amp upgrade will help with the b&w then it should do the same for my polk's. Then when I get the next speakers I will hopefully have what I need to get the most from them. Am I headed in the wrong direction here? Would really llike to get this right the first time.All suggestions and thoughts are much appreciated.
Thanks
Steve

Lots of good info. to think about.
Thanks
Steve