In general, avoid choosing a personal inkjet or laser copier. Not only will you pay more for printing, it does not have the same business security features that you receive with a business-grade copier because it isn’t intended for that market. That means that if you use a network or the Internet, you could be placing sensitive company information at risk. Looking at copiers, check to see if you can find a copier that offers automatic duplex capabilities. This will reduce your environmental impact because it lowers the amount of paper needed. A plus-side of duplex printing is that because it prints on both sides, it lowers your cost of paper.
Printers that see use from multiple people will need ethernet networking so that they can share. Wireless can also be a great option for a smaller work group, but the disadvantage is that the reliability tends to be somewhat spotty.