Digital BW, The Print

Okay, have gimp 2.2.x installed, for MAC OS X 10.3.9
got my epson printer C86 ( CYMK )installed, and my Nikon coolpix camera software
installed too...

Now, my colorsync software preferences profiles are as follows.

    RGB Default  = Nikon sRGB 4.0.0.3000
    CMYK Defalut = Nikon CMYK 4.0.0.3000
    Gray Default = NikonGrayG1.8 v4.0.0.3000


Now for the $64.00 dollar question,
do I tell Gimp to use the Nikon defaults,
or do I tell Epson printer to use the nikon defaults,
or is there something else???


Thanks ++
Rick