Yep, I use a Mac and I have to say that Apple Lossless is also the route I took. It seems pointless to store files in AIFF* (MAC equivalent of WAV), why waste the extra storage needed. MP3 or music compression just isn't an option. I want a faithful reproduction, not a photocopy!
I don't mind using ALAC either, it's compatible with my iPhone which I use daily on the way, and at work. IMO iTunes is an excellent jukebox software.
The only weak link is ripping using iTunes. I prefer to use XLD to encode into ALAC and then add into my library. At least I've got some way of telling if the rip was good or bad. XLD also allows me to convert FLAC to ALAC.
*AIFF allows you to add 'enbedded' meta information as part of its spec. WAV does not without a companion tool, and if you loose that library, you loose your tagging. BWAV allows meta tagging but nobody supports it outside the radio industry.
Andrew
20" Aluminium iMac with Lacie 2TB Firewire HDD running OS X 10.5.7 with iTunes 8.2 | Beresford TC-7520 (THS4032CD) & Apogee Duet | Genelec 6010A Speakers | Chord Chrysalis & Optichord Cables | Technics SL 1210