hmm, one channel at a time yanks me towards the Lavry AD11 then. Its stellar. Contrary to many, I'm a big believer in high quality converters because if they suck, add colour, aren't silky, are tinny NOT transparent, ... everything you run through your system will have the sound of that converter. So, ... mics, pre etc will be effected.
But, are you doing midi, do you need that as a part of your interface?
The Apollo looks to be the coolest, 8 channel, ITB rig going. I've not hear anything about their pre's.
Hope that helps.