My new Sharp Aquos LC32D40U has a native resolution of 1366x768. Apparently it will look it's best if given a 720p feed? I currently have a NAD T533 DVD player which outputs either 480i or 480p. I am outputting 480p right now. Is this correct? Does the Sharp have a built-in scaler that will upconvert the 480p signal to the native resolution or should I be sending it a 480i signal? Thanks.