Hi, I'm using my Zoom R8 as my regular audio interface into iMac running Logic. Left (hi-z) channel has started making a lot of hum/noise so was thinking about a dedicated audio interface. As you good chaps know all there is regards this I wondered what your opinion is on the above 3? or any other that I've missed. Only need for home recording with 2 channel input at most. I noticed the Presonus has what looks like thunderbolt USB, but the Roland has more dedicated knobs, while the Focusrite is 'trendy'. I think the specs are the same regards 24-bit/192kHz - but I don't know if that means the preamps will all be the same? Any help here would be appreciated. thanks, Eddie.