RGB psd to CMYK eps?

Most of the work I do has to be in CMYK when printed. So I mostly work in CMYK from the get go. Because the conversion usually screws up the colors.
Today I got someone else work, a designer from another country (can't contact him). He is basically doing same stuff (DVD covers). His work (PSD) was in RGB (nice colors), but he then somehow converted it to a CMYK eps almost without any loss in color. Sure there was some, but hardly that you could spot.
The EPS opened similar to a JPG in Photoshop. Whenever i try to save something as EPS. I always get the "Rasterize EPS Format" screen when opening it in PS.
Am I saving it wrong? I place my PSD into Illustrator and then save as EPS.
Any ideas on how? Or what is the best way to do this?
Thnx in advance

"None of you seem to mention any specific RGB- or CMYK-space, which seems suspicious to me."
I am quite new with the whole design for print, so could you elaborate more on this one? You talking about profiles?
"You mean graphic work or editing photographs?"
Graphic, but the reason I asked is because working and editing photos in RGB is easier. Like you mentioned.
"That usually indicates that the eps contains vector content and will also happen if Photoshop files with Vector Masks or type are saved as eps with »Include Vector Data«.", "Unless you add vector content in Illustrator that method seems unnecessary."
Yeah, I realize that now.

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GmR wrote:
> I am working with a CMYK Freehand design, and it
includes a cut out image on
> top layer. The image is in RGB. When I export it, I am
getting a colour shift
> on the transparent areas.
>
> Should I be working with a CMYK cut out image? If so,
how do I convert my RGB
> image to CMYK, keeping the transparent areas of the cut
out?
>
> Help much appreciated (ASAP)
> Regards
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RGB psd to CMYK eps?

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