Basically I want something like a Focusrite USB interface, but with TWO USB inputs, since I have two computers.

Requirements:

• balanced line outs
• 2x USB input
• at least 1 mic phantom input

Does anything like this exist?

I'm thinking about giving up and getting the Focusrite Scarlet 4i4 and plugging the Mac computer in via the Line Inputs, and PC via USB, but I worry about EMI/ground loop noise coming in that way. (Which is the problem I am trying to solve, as right now I have both computers going into a standard mixer, and the PC <-> mixer connection is introducing an insane amount of noise, every time I move the mouse or do anything on the PC it's very noisy.)