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.
Walt