This question can go a lot of ways... but, I'm wondering if I have a printer that supports CMKY, am I better off in Photoshop creating images in a CMKY colorspace, instead of RGB? Is there a "better" practice overall?

The confusing part is that monitors are RGB so you cannot see what you print. Also my EOS can take pictures optimized for Adobe RGB, but no CMKY. So I wonder if it's better to work in RGB after all and just hope it prints well?

Thanks gang!

Worry about that only if you are not the printer. As you are the printer, it is easy for you to print off a 'proof' as you can see how the output is immediately.

Look up color management in Photoshop and you will find many dozens of pages telling you how to ensure you get a good match from monitor to print. To me, however, the only sure method is to get a proof from the printer.

EDIT: Found this link which goes into this in detail:
http://photography.about.com/library/weekly/aa031703c.htm

Thanks Keith for the link, I have much more to learn about CMKY then I originally thought. :)

Well, you shouldn't make your job harder than it is. Unlike other forms of printing, photo printing is and should be very subjective. The color you see with your eye is different from the color your camera gets which is different from your monitor settings. Seeing as you are in control of the output as well as the input, you have a much easier time than someone who has to send out files.

If you are talking about an inkjet printer, they use RGB data, despite the fact that their inks are CMYK (plus their light versions etc.)

If you are talking about an inkjet printer, they use RGB data, despite the fact that their inks are CMYK (plus their light versions etc.)

Thanks Emre. I just heard the same from my photo teacher.
"People who work on real CMYK printers are totally different. That is a profession in itself."
I'll use RGB :)