I understand wanting to avoid compression wherever possible, but blind tests really do prove that there is almost absolutely no difference between a 320 kbps mp3 and a FLAC. The difference between 160 kbps is even very hard to tell as well. In the long list of factors influencing audio quality, file size compression is fairly close to the bottom in terms of how much it affects quality. Of course, it can be a huge factor if it's something like 96kbps or lower, but above that you have to be fairly discerning, and above 320 kbps it's really just a placebo.