Seeking Recommendations For Mac As a Pvr Hardware (needing Ir Support For Satellite)

Hi there,
I am looking for suggestions for how to set up a mac as PVR in a corporate situation where we have a two dish network satellite TV drops and boxes. The issue I see is most digital tv cards or firewire boxes that include tuners do not have an ir interface with the satellite boxes as tivos or replay do....

project goals:
Have a channel guide so recordings from multiple stations at different times can be made ahead of time and saved as mpeg 2 or 4 for later editing and playback.

Anyone out there have suggestions on hardware that can do channel tuning or has and IR interface compatible with dish network? Please let me know....