I just looked through your digital work and was wondering what type of color printer do you use?
I have a relatively inexpensive Hewlett Packard DeskJet...but I usually don't actually print things out. If I'm working with purely digital images in a collage, I tend to layer them all digitally and have them printed out by ezprints.com or someone else like that if I actually want a hard copy. When I'm working with both physical and digital images, I'm more likely to take them both into the digital realm by scanning the physical pieces instead of the other way round, printing out the digital ones.
I do have some collages that I have made that use printouts of my images and patterns, especially ones that contain image transfers, but honestly, if you're interested in doing a lot of printing out, I would probably recommend researching a more up-to-date and archival printer than mine!
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However you cannot beat Cyndi's suggestion of getting things professionally printed; it does show in the end result if the quality of the print is important and you cannot afford to run a top of the range printer.