PDF for print production

I am about to print a large format coffee table book in Singapore. Created in CS2 with a local icc profile embeded, I now have CS3 and want to confirm the best colour settings to provide the ideal PDF file for print production. Printer suggests I use ISO FOGRA 27 as the CMYK pre press settting. When I make the PDF file, the question is which format X1-a or X3, 1a does not embed the colour profile that has become part of this file and is the required format for one of our top printers in Johannesburg - Ultra Litho. X3 based on my reasding to date seems the better choice. In order for the ISO FOGRA27 profile to become the profile embedded in the book file, do I now when opening the InDesign book document in CS3, leave as is or assign/convert to current working space? Unable to find rational answers here in SA, few Adobe gurus to consult with, none with time to review the status of this project with me. Its crucial that I get it right the first time, and intend sending a double page spread created possibly 2 ways for them to produce and print as tests and send back so we can make a call on what looks more accurate. Rendering intents also are critical, nobody here can agree what is best, Perceptual or absolute? Any suggestions would be most appreciated. My Mac Pro is calibrated using Gretag Macbeth Eye One Proof and the Epson Pro 4000 printer is calibrated also. Thanks, Erik.