RAW + Adobe RGB ~ the way to go in Fireworks or any photography

When photographing - it is important to use the RAW format to save your images to the memory card, and use Adobe RGB for color space ... 

1. Save the file to your memory card as a RAW file.
2. It captures all the info that your lens can deliver to your memory card. 
3. It will allow the most flexibility in post processing to adjust colors and white balance.
4. Unlike Jpeg format, it doesn't compress your image - translated this means that as a Jpeg file, you lose details in the image.

for the photo geeks, Adobe has a pdf to explain RAW format in more details.

Adobe - RAW + Color Space details

Also if you can, save as ADOBE RGB file, it will capture the most colors in your image. According to Adobe "Some cameras let you set parameters for this conversion—typically, a choice of sRGB or Adobe RGB as color space, a sharpness value, and perhaps a tone curve or contrast setting." This setting will save the most color information that your camera is capable of using. sRGB is a format that throws away a significant amount of color data. Reference the Adobe article above for more info.