A much better upgrade wiich should be done no matter what speakers you end up owning is some easy and minimal room treatment. When I added two bass traps behind my speakers and two side absorbtion panels in front of my speakers I never heard a more significant improvement and I go thorugh a lot of equipment experimenting. I don't think you know what you speakers and electronics can do till you at least do some of this minimal room treatment - it effects bass, imaging, coherence, and balance - I think you would be suprised how much better what you have is once you get room treatment. I think it is one of the reasons the Merlin room is always among the best sounding rooms at shows, Bobby understand room treatment extremely well.
