If you only upgrade one component in HT what is it

"Skclarey":

Your system seems to be strong in all of the most important areas. So I cannot find any one component that I would upgrade. I placed in a corner and in a bind, I would say get a higher end DVD Player to complement your Sony DVP-S9000ES and for 1080p resolution from your RPTV, and I would relegate the Sony for audio duties only (i.e. -- SACD Listening). Aside from that, the only thing I can suggest is a couple of Power Conditioners to clean up the power that's going to your system (one for the audio and the other one for the video). Then afterwards, I would concentrate soley on the room/acoustic treatments.

Aside from what I said, I wouldn't make any wholesale changes to your system right now.

My $.02 worth.......

--Charles--

My 5cents worth: Get a Blueray player.

Any advice for power conditioners?

Upgrade your source. I've gone from the Denon DVD-5900, to Oppo, to the Toshiba HD-XA2. The Toshiba is in ANOTHER league in regards to the upconverting ability of standard dvd's. The sound is better than the Denon also. Use the HDMI to your Mitsubishi Diamond DLP, and you should see an eye-popping, almost hi-def picture.
If you then want to spend more, go with power conditioning.
Be aware however, that the best power conditioning units cost plenty. (IMO)

I'm with Avguygeorge...get an HD-DVD or Blueray player