David, thanks for your reply. Yes, I know that the Apogee is much more expensive than the Fireface, and I've heard really good things about the Fireface. Let me explain with an analogy: For a couple years I recorded vocals on an Equitek E-100 through an Avalon 737SP - then I got a Soundelux U99 mic, which costs a lot more than the Equitek did, but the resulting improvement in sound quality was dramatic. Basically, if the Apogee sounds a lot better and will work with Core Audio with no problems, then I would go with it, because I don't need a ton of inputs. I would love to hear feedback from anyone who may have had the opportunity to compare the Rosetta 800 with the Fireface 800, and/or if you have any other perspective David, given what I've written here, I would love to hear it. Thanks very much!