I have a Sharp Aquos LC-32D7U hooked up via HDMI to a Scientific Atlanta 8300HD, and set up output 1080i. I experimented with outputting 480i/p/720p signals in native format, but found the picture to be better with the cable box doing the scaling. However, I find the non HD picture to be atrocious even though my TV is on 32". My Denon DVD-2910 hooked up via DVI outputs pristine pictures so I know SD picture can in theory look better (maybe not as good as the DVD, but better). Is there any external processer that can make the non HD signals substantially better without spending over $1000?