Steuart:
I would say the answer depends on what satellite receiver you have now and how it’s connected to the 503, which you didn’t mention.
If you have a satellite receiver connected via S-Video, you should notice an improvement from a high definition receiver if you connect it to the 503’s input 2 from the receiver’s component outputs. Further, if you can get an HD receiver with the variable output feature, you can watch either SD or HD through input 2. The 503 will automatically switch from SD to HD or vice versa, depending on what it’s getting from the satellite receiver. I have this feature on a Sony SAT HD-100, and it works really well. The 503 also lets you set up separate adjustments for both SD and HD on input 2, which you might find useful. This means you can set different levels of brightness, contrast, etc. for SD and HD sources.
