Stay away form Kyocera and Konica (Minolta). Kyocera couldn't meet our demand per month, without breaking down all the time. Konica couldn't get drivers to work with our mixed Unix/NT4/Win2003 servers.
Lanier even wrote special drivers for SCT Banner use on our Unix boxes.
While I know you said photocopiers, the multiuse machines (scanner/printer/copier/fax) that Lanier puts out are upgradeable. Say, you only want coping right now. Fine, that is what board gets put in the machine. A simple upgrade gives you any combination or all of the features above.