We gave my son a 1080p TV last month and he used to have a 720p TV. I set his 360 to output at 720p with the old one, and I was going to change to 1080p now but I read where someone said it should still output at 720p for better performance or something like that. I know that 360 games are not 1080p but I thought maybe it was better for the 360 to do the scaling than the TV. What should it be set at or does it really make a difference?