Thanks, PX0, I hadn't seen those sites before. Unfortunately, the scans on Andy Decarli's site suffer from some pretty heavy moire effect; I tried fiddling around with descreening in my editor, but I couldn't quite get rid of its effects. While the NintAndBox one is better in that regard, I still see a fair amount of texture.
I'm pretty new to this, so I can't be sure of my instincts here, but I'd guess that running a descreen algorithm at the point of scanning would produce better results than running it after the fact on a JPG. Dr.Agon, would you mind checking whether or not you have the box? I'd really be interested to see a scan made with descreening on if possible.