Just to clarify things for you in case you're operating under a mistaken assumption, the Oppo is NOT a HD-DVD player. It will only "upconvert" standard definition 480i DVD video to 720p/1080i. It will not play HD-DVD or Blu-ray discs:
http://www.oppodigital.com/opdv971h.html
Whether or not this will be of benefit to you depends on your display. Upconversion of standard def DVD to HD resolutions typically results in improvements because, by matching a HD display device's native resolution, it eliminates unneccesary additional processing by the display which usually results in fewer image artifacts. It's not a magic bullet however. Standard def DVD is standard def DVD. Upconversion will not make it look like HD-DVD or Blu-ray. You can't get any more resolution out of SD DVD than what's encoded in the video data.
