Andy,
You cannot upgrade your skimmer to the DC pump but you can definitely upgrade it to an HY-2000S (Bubble Blaster). It will definitely be a substantial upgrade and worth the extra cash.
Here is the link, just make sure you select the correct adapter for your skimmer...
http://www.coralvue.com/reef-octopus-bubble-blaster-2000-skimmer-pump
Regards,
Carlos Chacon
CoralVue