I agree that 192kbps is fine the vast majority of the time but it still makes perfect sense to rip your collection to FLAC especially if you are dumping the original media. While we can sit and argue whether 192kbps or 320kbps is better, I'm sure most would agree that re-encoding a compressed file into another compressed format is a bad idea. That means if you have any intention of encoding those songs in a different format in the future it's really in your best interest to keep a lossless copy around.