Bob,
Thanks for the insight, I did call Proavio directly and talked to there technical support team, they said there was no expansion possibilities for their EB800MSV2 PCI-e based version at this time. I did go back to there website, and noted that the Thunderbolt solution provides future expansion and their DS316JS rack mount can be expanded but nothing I could find for EB800MSV2 PCI-e version. Having said that and based your feedback I will call back Proavio on Tuesday and check my facts.
Thanks again for the help
Lou