If you want to keep a record of your servicing just keep a folder of all the receipts. I take more stock in these than a stamped book. I quite sure that even the manufacturer wouldn't provide your with new service books, and you can't have mine
As for your brakes, your front ones are doing most of the work 100% of the time. I assume you don't have Brembo's so that would be simplest upgrade. Keep your eye's out for some v35/GTR Brembo's.