Best way to expand Apogee Quartet through ADAT? Ensemble?

I'm looking to do some recording that requires more than the 4 mic pres that my Quartet provides. It seems like plugging in more inputs via ADAT is the way to go. I'd like to keep it under $1000, so I've been looking at older Ensembles as an option. Does it matter that they're old, since it's just going through ADAT? I just want some nice sounding pres and don't care that much about a bunch of modern features. Having 4 more pres would be good, but 8 would be even better. Any recommendations besides the Ensemble? To get more bang for my buck, I'd like to get something used.



Part two to my question is whether my computer can handle all the new inputs. I'm running Logic X on a 2.9 GHz Macbook Pro from 2012.



Thanks!

Best way to expand Apogee Quartet through ADAT? Ensemble?