Pretty sure your room could use work, as most rooms do, but I think your Denon and your Sony are your main concerns at this time.
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You do not describe enough of your room but it seems as if it is somewhat bright (from your assessment) and it has a hard reflective floor (and, I presume, ceiling).
You should consider acoustic treatment for your room. It can be unobtrusive or, even, covered/masked by drapes and furniture. It will make a huge difference and improvement for ANY equipment you choose.
I am not familiar with the tweeters chosen for the B&W 600 series speakers, but the 800 series had metal dome tweeters. These are more sensitive in revealing issues in the front end of your system. In general, the Denon electronics are a tad uptilted to begin with, and if you are serious about Audio, the SONY multi disc player should be the first piece to go. Consider purchasing a single disc, dedicated CD player...with a solid drive and isolated chassis. Sim Audio makes a very nice, musical unit, the Equinox, for about $1200 on the Gon. I would make a move on the front end because you can only get quality out if you put quality into the music stream.
If you opt to upgrade in the future, purchase a speaker with a soft dome tweeter rather than a metal tweeter. Dynaudio 1.8 is an excellent floorstanding speaker and very musical...one was recently for sale. The Dynaudio 1.3 is also nice for a bookshelf, and the Reynaud Twin is a steal, going for $600-$700 on the Gon. Another great line of speakers are the Proacs...the SC-1 or Proac 2s are super musical...and you can probably find the 125S or 150S available for about $900-$1200. These are exceptional speakers for any amount of money.
I haven't had the inclination or luxury to go through 10 pairs of speakers on my path to audio discovery. So, in general, a metal dome tweeter will not be enhanced by electronics that have a forward signature. Listen to a good speaker like a Proac 1SC and a B&W 805 Matrix, same price point, and then decide which is more musical...check out the female voice along with the taunt bass response, the natural decay of the piano, the difference between a soprano sax and a trumpet. And for budget, audition a pair of Reynaud Twins. You can probably pick them up for $600 in great shap on the Gon, and they will blow away the B&Ws of equal price or at three times the price.
And address the front end before you do anything.
Well where to start.
If you have the time reading this whole thread might be worth while.
System synergy is extreamly important this includes the room. The above system would be all used now and should be able to be gotten for about half of what is listed in the post.
It is a good starter system IMHO.