I am trying to decide to buy one from the other. I have a Vizio 50" 720p plasma so naturally I would buy the Oppo DV-920HD to take advantage of the upconversion. But I also want to future proof myself when I will buy a 1080p set by buying the DV-981HD. My question is if I get the DV-981HD, should it be able to upconvert to 1080i still?