Need more Optical Audio IN's or some other solution

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Okay, I've been trying to decide how to resolve my conflict. Currently, I have the following setup:

Receiver: SONY STR-K790
Blurray: PS3
1080p Computer
DishHD Receiver
Toshiba 1080p 3x hdmi

The Sony is powered as such:
1x optical in - PS3
1x digital coax - 1080p PC
RCA stereo - DishHD Receiver

I'd like to get all of the audio digitalized. The receiver and the TV both have optical audio OUT's to be connected to a receiver.

I'm wondering if there is some method to combine the outputs to automatically switch between Optical Audio feeds depending on device usage. I would like to be able to have 3x digital opticals combined.

Or, is there another CHEAP receiver I should use?

I can't rely on HDMI audio and drop them down from the TV as it seems to not allow passthru of all channels and only supports Dolby and PCM, no DTS.