First of all, congratulations on the 9000, it really is an excellent printer, however, it does need setting up carefully - there's a lot of ways to affect the final colour balance of your final prints between pressing the shutter release and looking at your work on paper.
My experience of the 9000 is that it is quite sensitive to the type of paper you are putting through it - it needs to know what you're using and, if it doesn't "know" your paper, then you need to profile it.
Canon has a good summary of colour management in this document
Colour Management.
Have a careful read of the manual for the printer too, there's some very detailed information in there about setting up your printer with colour in mind.
I'm afraid that the only way that you are going to achieve consistantly reliable results, from camera to monitor to paper, is to properly calibrate both your monitor and printer, AND to set your white balance manually each time. It can be a time consuming and costly process - google Spyder3 Studio or ColorMunki to see what you might be in for.
Good luck!