In general, saturation is something that can be tuned to your taste, though becasue of the Bayer filter used on most image sensors, reds and blues tend to be artifically enhanced sometimesm especially reds.
From what you say you want, I think you might be best served by taking a look at the Sigma SD14 dSLR
, or even the Sigma DP2 P&S
. They use a Foveon image sensor that can detect the full spectrum of light at each pixel. I think you'd be more satisfied with one of these than with anything else.