hmmm.. I had this conversation with Tehnevs over youtube, and I asked him if it was good to use the mac to record with. He told me that the mac has too many problems with recording/editing. So I am not sure if I would agree with skorch. But I have never tried it so I am not sure, but I just thought it would be good to mention.
But of course, if you only have a mac then the best choice must be the hauppauge.