Thanks. I had drop-out issues with SB3 in the past and was concerned about that recurring. I'll still try streaming, as well as the mobile/bus-powered drive since I have one. More then likely I'll have to run ethernet cable to iMac.
There's a lot more digital wireless and FW/USB sources now, but I don't have time to go through that again. I need something this week. If not, I'd look into the Weiss FW converter and others. I'd like to plug my iMac directly into my reimyo DAP-777 but not if it's going to cost thousands. I already put that into the DAC and other gear. And I had the iTransport/iPod server. Loved it, but wanted a larger GUI and didn't want to have to copy music over to it. It'd be great if you could use iTouch/iPhone/iPad in a dock and stream through that right into the DAC.