Yada, yada, yada. Sorry, no disrespect intended to well intended suggestions, but you don't provide nearly enough information for truly meaningful suggestions. What amp? Are you keeping the Denon? Where are you placing your speakers in the room? What is the room like? After 40+ years (ouch!) in this hobby, about the only thing that I have learned with absolute certainty is that generalizations mean very little; ESPECIALLY re speaker placement and speaker/room interactions.
In your system page you give glowing reports to the sound you get with your one-way speakers, and you do a good job of describing what you like about them and why. Why not keep them and add a subwoofer like a REL Strata for full(er) range sound? A lot of flexibility re sub placement, and you get to keep everything that you like about your current speakers; and more, as a well integrated sub will improve just about everything.
Good luck.
In your system page you give glowing reports to the sound you get with your one-way speakers, and you do a good job of describing what you like about them and why. Why not keep them and add a subwoofer like a REL Strata for full(er) range sound? A lot of flexibility re sub placement, and you get to keep everything that you like about your current speakers; and more, as a well integrated sub will improve just about everything.
Good luck.