My old TV was 1080i only so I didn't have a choice. I just replaced it with a 1080p and am not sure if I should leave the setup as 1080i or 720p on my HD-A3. Any suggestions on which works best?
You may find that setting the output resolution of the player to match as closely as possible the native resolution of your display provides the best picture performance (e.g., 720p for 720p and 1080i for 1080i or 1080p).
Most likely if you have a 1080p tv that was built in the last year and a half its not going to make a difference. The 1080i signal has the same data as the 1080p signal, the TV just has to deinterlace the signal.