Two months ago I was in the same situation you are in right now. I was debating if I will get the 5803A or the Z9. The question you should ask yourself is that will the receiver be used more for movies or more for music? The DSP modes on the Yamaha is by far the best. I still have a Yamaha (DSP-A1) in the other room and I had this system for 5 years as my main system. I have no complaints with it. The sound in both music and movies is fantastic. After the Audioholics review of the Z9 came out, I decided to purchase the 5803A because I did'nt need all the features that came with the Z9. Even with the DSP-A1, I hardly change the settings on the system. Having both the Yamaha and Denon, MY OPINION is that the Denon sounded better and cleaner. It is warm not bright compared to the Yamaha. The DSP mode is not bad either. Also another thing to consider, the subwoofer does not work on the Yamaha in Direct/Pure Direct mode. One advantage the Yamaha have is the video processing. Again as I stated earlier, Do you need this feature? Another thing to consider, your speakers. I am using powered, bi-amped main speakers. It is like having separates because I am not using the power amplifier section of the 5803A. FYI, I was using the same set of speakers with the Yamaha that's why I can compare them side by side. Hopefully I was able to help you make a decision on what to purchase.