I am a FIOS TV user also. I have not had a chance to set up LMCE with my FIOS box yet. I am waiting for some more hardware and the 710 release.
I was told by my FIOS Tech that most of the SD channels are passed unencrypted without a need for a VZ box. I have a line running to my Hauppauge card. I looked at my DVR and regular HD box and both are QIP6200-2's. Both have ethernet - USB- Firewire. I will let you know how I make out .