I use a 7900 also, and say welcome to the wonderful and highly frustrating world of color management. Here is my answer. Others may disagree, and other opinions would certainly be interesting. And you probably won't like my answer! You need a profile for each printer and each paper you use. Profiles need to be printer/paper specific. Some would suggest you even need new profiles when replacing ink, but I have not found that necessary. You can generally download pretty good profiles from manufacturers web sites. If this doesn't work for you they can be custom made, each in the $35 or so range. I have found it cost-effective to make my own using a ColorMunki. This device will also allow the monitor to be calibrated.
And speaking of monitor calibration, the problem obviously becomes matching what you see on your monitor to what comes out of the printer, or visa versa. This process is what makes a color calibrated workflow such a nightmare. You are trying to match a screen image with a reflected paper image. The screen on most monitors has a much more limited gamut than does your printer. So this is not an easy task. I have found that the paper profile that I make is generally pretty correct, and the monitor is more of a problem. I try to match the monitor to the print, not the other way around. I took delivery of a NEC PA271 monitor this week, and can honestly say it is the first monitor I have ever used that I have been able to come pretty darn close to matching the monitor and printer. The NEC is a so-called wide gamut monitor, allegedly capable of showing 97+% of the Adobe RGB color gamut. As a contrast, I have read that the Apple Cinema Display (which I thought was pretty darn good) is somewhere around 71%. I haven't seen figures about other monitors.
Anyhow, good luck with all of this. Read and experiment, and be prepared to use up a bunch of paper and ink in the process! This forum is excellent for ideas and tips, as others have faced the same issues you are wading into. Questions are good, as there is always someone who has dealt with your problem and can help. And as an aside, the roll of paper that came with the printer is pretty crappy, useful only for doing alignment tests and things of that sort.