I am trying to choose a surround sound system for a new projector that I have. I am looking at the Onkyo HT-S3100 or the HT-S6100. My main interest is how good is the HT-S6100 at upscaling SD programming at 1080i, which is the highest my projector can display. I have hooked it up to my sat box using a S-Video cable and it looks pretty poor, plus it is in 4:3 instead of 16:9. Would the HT-S6100 be worth spending the extra coin on to gain the video upscaling feature? If you have used this feature of your HT-S6100, I would like your input.