If you're running AES out you want the ODL-312. Best price I found was $56 shipped from Full Compass. This price isn't published on their website, so give 'em a call.
The ODL-312 requires 9v external power and draws 50mA. I power mine with a 9.6v 1600 mAH RC battery which'll run the thing for 25+ hours. Check the Archival Info for a thread on some quality optical cable options.