Al, as you infer, the deinterlacing and scaling done in the receiver shouldn't be used unless it would be visibly better than the deinterlacing and scaling done in the TV. The test reports on recent Panasonic plasmas indicate that they do an excellent job of processing 480i DVD and other material. My thought is that the 3806 would probably serve you well and that the 4306 wouldn't have a significant advantage.

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Enjoy the music, not the equipment.