IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
The main things I would look for are built in disk encryption, automatic disk wiping, and automatic log wiping. Just make sure to enable all of them, they may not be turned on by default depending on manufacturer. Also, a good printer should include a network firewall, which you should also enable. If the printers you are looking at have a web based interface, make sure that you use a strong password for it.