Are you sure about the mic preamps, Josef? The Ensemble has more gain, but you're going through them with either unit (i.e. just like the DA7 the inputs are designed to accept a wide range of input levels). I found the difference between the input and the output in the units to have the same quality, if that makes sense.
MH also makes a 2-channel box, the ULN-2, that supposedly has better preamps than the 2882. But I'm very happy with the 2882...and my outboard Millennias, of course.
I had a FF400 here at the same time, and it sounds another hair more brittle than the other two but still very good. Its software is good too; the only thing is that you can (and I did) blow it out by hot-plugging it, which really shouldn't happen with a FireWire device.
Are you using the box just for digital conversion? If so you might save money by not getting FireWire I/O.
One other thing: the MH boxes can run on bus power (i.e. they're portable) or in "high power" mode - their 24V power supply. The latter makes quite a difference to the sound.
And I don't want to pretend that this isn't somewhat subjective. I did listen to all three units for a long time, however.