Ken
Depends what connections the BT box and the PVR need. If either or both do HD, you have 2 or 3 devices competing for your HDMI in on the Samsung. You could get a HDMI switcher, basically a device which allows you to connect both devices (and more) into the Samsung. These can be pretty inexpensive, starting at less than £20.ÿ
I assume you will use optical or coaxial digital connections for sound from the BD, PVR and BT Vision into the amp.
If you later upgrade the amp to one with HD Audio, you can then connect all HDMI devices into the amp and have one HDMI going out to the Samsung. ÿÿ