Thanks for the reply. I assumed the HDX preference in the Citrix environment was only for the Xenith/Xenith2 clients so that was my lack of understanding. I will test on RDP just to make sure with one of my T series thin clients but I believe the site where we will need the best possible multimedia performance will be XenDesktop only.
I did see your article on tuning for Citrix so thanks for that as well.