FYI, unlike Direct boxes, Dish boxes will not let you select native resolution or pass thru. You have to select a fixed resolution for output.

So....the Oppo can't really do much for you. You probably have your Dish box set to 1080I, so your dish box is doing the upscaling of any 480 and 720 material to 1080i. Sending the Dish's output thru the Oppo would then deinterlace 1080i to 1080p, but I doubt you would see a difference.

If you set your Dish box output to 480, yes the Oppo would upscale everything, but you'd be downconverting your HD material with the Dish box before it went to the Oppo.

Having said that, I believe folks are having good results using the Oppo and it's HDMI inputs as a scaler, just doesn't work well unless you can send native resolutions to the Oppo.