I have the Pioneer 79avi. I replaced a Denon 2910 because I had really bad macroblocking issues with it on my DLP. A lot of people really like the 2910 but it depends on your display as to whether or not the MB bug will bite you.
The Pioneer PQ so far is outstanding and the sound quality is superior to the 2910 IMO. BUT..if you can get the 2910 and find it works well with your set, you will be very happy with it. The worst that can happen is that you return it if you see any macroblocking. Good luck.