Pushing the limit of the envelope

OK, DICE has told me they have a splitter that will allow my SiriusPrius Radio (06 with NAV) head unit to co exist with their new HD Unit so I can have the best of both worlds (cross your fingers and hope all the functionality still works). Now I want to install, at the same time I pull the dash and MFD, the ultimate Lockpick 3 modules. My questions is, what is the upper limit of the daisy chain of recognition of all of these devices? Does anyone know or have any idea? Can I install all three and have them work together?

I sure would like to be able to chose between Sirius and HD, but also would like to be able to access my bluetooth phone addresses while driving. Am I asking too much or does this sound possible? Anyone expert enough to take a guess?

Or, if I can only have two, which would you chose?