So, here is where I am at - I bought a 4x1 HDMI switch from Monoprice (PN 5557) and have an appleTV2 and samsung bluray feeding into that, and the HDMI out from the switch to the projector. I am using the digital coax out of the switch into the SR607 with the blown HDMI board. So far, the picture from Netflix or HBO-TOGO look good and the audio is synced with the video. Have yet to run a disc, but at least I can say the streaming works and so does the 5.1 sound.
Thanks for everyone's thoughts. To replace the HDMI board would have cost $200, and the switch was $45. I am not ready to move on from my Onkyo just yet, so this seems like a good way to make do till I find a new receiver some time next year.
Good to hear, thanks for posting. That should get you by until you're ready to upgrade.