I also have an HR20 -700 DVR; I go directly from DVR to Sony KDS60A3000 by way of HDMI (bypassing 990 on the video path). I have very few problems with lip synch issues (OTA PBS occasionally, but that's a known issue with WGBH/Boston). Optical out from DVR to 990......Same setup for my Blu-Ray, also (bypass 990 on the video path).
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Anthem MRX-500/ Outlaw 7500, Paradigm Studio 100's Fronts, Paradigm CC-590 Center, Phase Technology Dipole rears , Martin Logan Dynamo sub, Oppo BDP-103, DIRECTV H22-200 DVR HD receiver, Samsung PN60E8000 3D Plasma 60"
2nd System
B&K ST 202 Amp, Outlaw 990, Rotel RCD 1072CD, Yaqin CD 1 Tube Buffer, Apogee Centaur Minors, Phase Technology Model 10 Sub, Rotel RP-855 turntable, Panasonic DMP-BD30, DIRECTV H21-700 DVR HD receiver, Free Agent Home Theatre+, Vizio 40" LED