I think there is no "right" answer to your question. Speaker selection is Very important, but so is the preamp, poweramp, and particularly the source. Ultimately, it is the synergy between components and cables in the system, and the weakest link that will give it away. If your system had good but revealing speakers like, for example, B&W N-805, it would not sound good with a poor digital source, and you would be much better of with speakers offering less details and resolution. On the other hand, an excellent source, is more likely to provide a more positive overall effect in your system regardless of other system components. So in regard to your question, you really need to be more specific as to what the current components are...
Good luck.
Good luck.