Charles, just rip to FLAC. FLAC and WAV are the same thing, and will sound exactly the same. FLAC give you the ability to add metadata (music tags) to the the songs, it is made for streaming so you can use seek functions without error, it is also the defacto standard as well as free to use.
AIFF is another uncompressed format just like WAV so the files sizes are just as large and was developed by apple but has since been made free like FLAC. It doesn't fully support streaming but seems to work most times. It does support tagging. If you primarily use apple products then you can use that, but I can't see another reason to use it with FLAC so much the standard at this point.
The idea that FLAC is someone how less fidelity than WAV is really just a lack of understanding of the FLAC format. It is a the exact WAV file in a transportable and streamable compressed file (think zip files). The sound file is not compressed in anyway like MP3 just the file is smaller. When the player gets the FLAC file it retrieves the uncompressed WAV and plays that. Meaning a WAV file and it's FLAC counterpart when played by the music player are the exact same file. So yeah it will always sound the same.
In the end it's your choice, as long as you don't use a compressed music format like pus, MP3, Vorbis, Musepack, AAC, ATRAC and WMZ and stick to any uncompressed music formats like FLAC, ALAC, and even AIFF or WAV you will be fine.
