Laser printers are the way to go. They are typically for offices and follow a different business level: large volume printing and low-cost ink.
If you only need to print a few times per year, it's far cheaper to buy a laser w/ toner. With inkjet, you'll have to buy (and wait for) new ink cartridges because they dry out in less than a year.
If you need to print a lot of color materials frequently and don't mind the quality, then ink jet is a better deal.
I had good luck with Oki printers (most of them come with Duplex unit, Ethernet and all OS support), a lot of people are very happy with Brother printers.