We use an AJA Io LD. I have my Mackie Mixer feeding my inputs on the Sony SX machine. Our booth comes though the mixer via the analog inputs on the front of the deck & SDI out back to the AJA.
Beside the G5 what other equipment are you using?
Internal Drives, Apple Xserve Raid, AJA Boxes ect.
Any newer bells & whistles in 5.1 that 5.0.4 didn’t have, beside the Media Manger fix?