Seeking advice on how to improve my system

In relation to the quality of your system, 10 foot run of Kimber PBJ and the 8TC speaker cables seem like the weak point to me. I would definitively explore and play with alternatives. Check out threads on Anti-cables, Morrow Audio Cables.. to name a few. Some have a 60 day return policy (Morrow) so there isn't much to loose if it doesn't match with your system. I also second previous recommendations regarding AC power.

I'm surprised that no one has mentioned acoustical treatment. Whether you want to admit it or not the room in which you listen is the most vital component of your playback system and ignoring the effects it can have on the qulity of music played back in your space is tantamount to pure denial. Acoustical issues within your room should be addressed first, then everything else after. If you fail to address acoustical issues that may exist in yous listening environment then no amount of tweaking the other components is going to alleviate the sound quality isssues you may have. A good and reasonably inexpensive place to start would be Jim Smiths books or DVD, and then possibly moving on to the plethora of more tecnacal manuals that exist on the subject of room acoustics and how to tune them properly.

I agree with Rcrerar.
The sound you hear from your system is not just components. It's a combination of your system and your room. It will be the biggest upgrade for the money.

with your components, there is nothing to do! Enjoy it. Maybe moving the speakers will change the sound, which should satify the urge to do something.

To all nine responders in under 24 hours ... thanks for your inputs!

I have noticed an improvement from moving the speakers further away from the sidewall, and moving the sofa that was between the speakers to a side wall. Lyrics on vocals are now clearer, the imaging on jazz pieces stable and not at all confused like they were before, and the low level details on classical pieces like the cushion of air from a soft tympani stroke or violin pizzicatos more noticeable. Next step based on your inputs is to move the speakers further from the back wall and play with toe-in and listening chair position.

I have a little more treble energy in the system than I would like, perhaps from the live room. Only absorbing surfaces are a sofa, a chair and the area rug. Any recommendations on managing the treble energy in the room? Rcrerar mentions Jim Smith's books and DVD which I need to check out (so far am reading Robert Hartley's guide which does not have much info on this specific topic.)

Once the acoustics are handled it will be on to the cables and AC power conditioning ... what is your experience with the AC filters that clean out the RF and other noise vs the much more expensive units that create a pure 60 Hz? Do these units really work well with high powered amps that draw 1 to 1.8 kilowatts from the AC mains? Should I consider this just for the CDP and pre?