krbtv- Call the printer and find the lpi of the halftone press that is going to be used (Not the image setter), it will (probably) be 125 - 175 lpi, then double that, that will be the dpi you should have, dpi x inches = pixels, thus if the press is 150 lpi you would need 300 x 8 or 10, or 2400 x 3000 pixels for profeessional level results. As you already know, save as a Tiff. Don't use EPS, especially on a PC, Tiff would be best