iMark:
Sorry to be a bit of bore but if you can hear difference between AIFF and Apple Lossless: it has to be in your mind. Lossless is just a compression technology which will give you full AIFF-like quality on playback. If you would convert your Lossless file back to AIFF it would be identical to your original AIFF flie.
I like the way someone else put it. If they would have called it audio zip everyone would understand that no data is lost during the compression.
I've found no reason to disagree with this yet. Lossless is...well, you know how it goes.