Hi! I am a music lover, and I am planning to buy a Hifiman HM-801, and I have read in many blog posts that the best way to hear music is through 24 bit-96 kHz FLAC or CD audio quality, I am also planning on buying the UE 18, so I don't want crappy music on my expensive gear. I have bought most of my music through iTunes, can it be converted back to FLAC or CD audio? The rest of my music has been imported through CD's but most of them were borrowed or I lost them, and they are all in AAC files...WHAT SHOULD I DO?!