You need to look at dye sub printers to begin to move towards color accurate printing. You'll also need color correction for the monitors and printers to finish the job.
Also, I've had to move to the brightest paper I could find. Copier paper while cheap is not suitable for color accurate prints.
Bob
I've been looking at color lasers for my graphics business, but don't anticipate doing any serious or full time work with one (basically for quick proofs, flyers, etc) so recently went to Staples to check out the HP 1600. I printed a sample print and the background, which I assume is supposed to be white, came out with a dark black/gray marbled effect. They had a 2600n and 3600n beside the 1600, so printed the sample pages from each of them and saw the same thing. After looking through the menu on the 1600, I found the cleaning cycle, so tried that. Nothing changed. I did a few more cleaning cycles and the marbling began to appear lighter, but still there. I ended up running it through 15 cleaning cycles and never did get a clean sheet to come out, either on the sample or the cleaning sheet itself. I did the same on the other two printers and nothing came out white. The pages always looked a little dirty. I've since read many online complaints about this. While there, I tried standard copy paper as well as laser paper designed for use in color lasers. Always got the dirty backgrounds.
Since I've never owned a color laser, I'm not familiar with maintenance requirements. However, I did try two Okidatas here in my office, the c3400 and c5500, and neither did this. I just didn't like the color reproduction, which consistently produced a red/magenta cast with no adjustment on either printer to balance color. Anyway, I'm wondering if the HPs or any true color laser requires cleaning cycle maintenance on a regular basis from the start to maintain print quality. It could be that these printers on display at Staples, even though the manager said they'd been on display only a month, have simply never been maintained using the cleaning cycle from the start. Maybe if it's let go too long, there's no going back...and you get the gray, dirty backgrounds?
Is this the norm with lasers in general, or with HPs in particular? I've been reading a lot of posts, and have yet to see a post complaining about this problem with any other make of color laser. It's always HP.
DC

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic