CMYK is a color space option...so it would be the correct one to use. Just make sure that if your images are not in that space already...that you purposely convert them...because otherwise they may just get adapted somewhere in the process and that will surely mess with your colors.
ahhh I see thanks...one more question on my image file it now says "CMYK/8" The 8 is the bits right? 8 bits or 16 bits...what the differenceI don't have photoshop in front of me right now but it's under image mode, if I do recall. Image-->image mode--> cmyk