[Serendipity]

INTERFACES
• DVI video connector with splitter supports two external DVI
displays (1280x1024) with optional touch screen control

This datasheet seems to say that any monitor with DVI connector will work, although I would still check with someone else on the board who has used an Ion, or one of our ETC friends.

Edit:
The Ion Manual gives hardware setup instructions on page 22 of the pdf:
Setting Up the Hardware
Follow these steps to prepare your Ion for use. [snip]
Step 2: Connect any monitors to the proper ports on the back of the console. Your monitor
connection choices are:
• Single VGA monitor connected to the blue VGA connector.
• Single DVI monitor connected to the white DVI port (using the “Y” cable).
• Two DVI monitors connected to the DVI port using the “Y” cable...
Any monitor attached to the DVI “Y” cable must be a DVI monitor. DVI-VGA
adaptors will not work with the “Y” cable.