For both cases, I would think an Epson Perfection V700
or Perfection V750-M
scanner would fill the bill. I would have suggested Microtek, but they seem to have faded into the background noise.
For really good results, I'd go with the Nikon 9000
but that might be over-kill.
For stunning and excellent, the Imacons
are beatable only by a true drum scanner.